Update readme with penguins dataset source

README.md

@@ -76,3 +76,12 @@ SOFTWARE.
 #### World Country Outlines
 
 <https://github.com/johan/world.geo.json/tree/master>
+
+### Penguins
+
+> Size measurements, clutch observations, and blood isotope ratios for 344 adult foraging Adélie, Chinstrap, and Gentoo penguins observed on islands in the Palmer Archipelago near Palmer Station, Antarctica. Data were collected and made available by Dr. Kristen Gorman and the Palmer Station, Antarctica Long Term Ecological Research (LTER) Program.
+- [Source](https://github.com/mcnakhaee/palmerpenguins)
+
+Data are available by CC-0 license in accordance with the Palmer Station LTER Data Policy and the LTER Data Access Policy for Type I data.
+
+Imported via the [palmerpenguins](https://github.com/mcnakhaee/palmerpenguins) package, created by [Muhammad Chenariyan Nakhaee](https://github.com/mcnakhaee).