simple readme

README.md

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+# ChaiVM - Virtual machine for chai bytecode.
+## How to build:
+```shell
+$ make build
+```
+## How to use
+```shell
+$ build/chai <app.chai>
+```
+### Chai bytecode currently is just a Sequence of instructions.
+For instance, there is disassembler of simple app.chai
+```
+Mov 6 r2
+Mov 8 r3
+Ldra r3
+Mul r2
+Print acc
+Mov o ro
+Ret;
+```
+Where Ret returns exit code `r0`.
+This script compiled to chai-bytecode should print "0", because '0' == 48.