Move contributor list to a file

CONTRIBUTORS.md

@@ -0,0 +1,7 @@
+Names in no particular order:
+
+* [jingweno](https://github.com/jingweno)
+* [tgkokk] (https://github.com/tgkokk)
+* [dwb](https://github.com/dwb)
+* [jgable](https://github.com/jgable)
+* [jroes](https://github.com/jroes)