Add extension source, license, and dependencies

LICENSE.txt

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+Some portions of this software (specifically, files in the "lib" directory)
+are subject to a different copyright than the rest of the software, but are used
+with permission. See the license files in the "lib" directory for the exact
+license on each file.
+
+The original version of the file "blindfold.js" (originally by a different name)
+is a part of the "gmail-chrome-extension-boilerplate" project and is Copyright
+(c) 2017 Kartik Talwar.
+
+MIT License
+
+Original work Copyright (c) 2017 Kartik Talwar
+Modified work, and all other work unless otherwise noted Copyright (c) 2017
+Nathaniel Paulus
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

blindfold.js

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+/* eslint-env browser */
+/* global Gmail */
+/* eslint no-undef: "error" */
+
+var gmail;
+
+function refresh(f) {
+  if( (/in/.test(document.readyState)) || (typeof Gmail === 'undefined') ) {
+    setTimeout('refresh(' + f + ')', 10);
+  } else {
+    f();
+  }
+}
+
+function info(msg) {
+  console.info("Blindfold: " + msg);
+}
+
+var main = function(){
+  gmail = new Gmail();
+  info('Initialized');
+
+  gmail.observe.before('send_message', function(url, body, data, xhr){
+      info('Message sending detected');
+      var body_params = xhr.xhrParams.body_params;
+      var ccCount = body_params.cc ? (typeof body_params.cc === 'array' ? body_params.cc.length : 1) : 0;
+      var toCount = body_params.to ? (typeof body_params.to === 'array' ? body_params.to.length : 1) : 0;
+      var total = toCount + ccCount;
+
+      if(total > 1) {
+        info('Prompting before sending this message');
+        if(!confirm('Send a message to ' + total + ' recepiants in to and carbon copy fields?')) {
+          xhr.abort();
+          info('Canceling send as instructed by user');
+        }
+        else info('Continuing with send as instructed by user');
+      }
+      else info('Not prompting before sending this message');
+  })
+
+}
+
+
+refresh(main);

content.js

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+var scripts = ['lib/jquery-3.1.1.min.js', 'lib/gmail.js', 'blindfold.js'];
+
+scripts.forEach(function (script) {
+  var tag = document.createElement('script');
+  tag.src = chrome.extension.getURL(script);
+  (document.head || document.documentElement).appendChild(tag);
+});
+
+// var j = document.createElement('script');
+// j.src = chrome.extension.getURL('jquery-1.10.2.min.js');
+// (document.head || document.documentElement).appendChild(j);
+//
+// var g = document.createElement('script');
+// g.src = chrome.extension.getURL('gmail.js');
+// (document.head || document.documentElement).appendChild(g);
+//
+// var s = document.createElement('script');
+// s.src = chrome.extension.getURL('main.js');
+// (document.head || document.documentElement).appendChild(s);

lib/LICENSE-GMAILJS.txt

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+The following license applies to the file gmail.js:
+
+The MIT License (MIT)
+
+Copyright (c) 2014 Kartik Talwar
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

lib/LICENSE-JQUERY.txt

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+The following license applies to the jQuery file in this project. The exact file 
+name may change from time to time due to containing the jQuery version number, 
+but should be found in the "lib" directory and contain "jquery" in the name. 
+Note that the other files the license refers to ("except as documented below") 
+to are not reproduced in this project. Beginning of license:
+
+Copyright JS Foundation and other contributors, https://js.foundation/
+
+This software consists of voluntary contributions made by many
+individuals. For exact contribution history, see the revision history
+available at https://github.com/jquery/jquery
+
+The following license applies to all parts of this software except as
+documented below:
+
+====
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+====
+
+All files located in the node_modules and external directories are
+externally maintained libraries used by this software which have their
+own licenses; we recommend you read them, as their terms may differ from
+the terms above.
+