add extra contributors file

Author: pkyeck

CONTRIBUTORS.md

@@ -0,0 +1,23 @@
+#Contributors
+
+Many thanks to the following people for helping me with this:
+
+- mennopruijssers
+- samlown
+- DanLite
+- bnadim
+- kayleg
+- psineur
+- dgthistle
+- paiv
+- antonholmquist
+- spesholized
+- insanehunter
+- RevCBH
+- elwerene
+- MichaelScaria
+- beepscore
+- progeddog
+- bridger
+- YannickL
+- taiyangc