Update contribution guidelines

Author: cquanu

CONTRIBUTING.md

@@ -1,3 +1,18 @@
 ## Before Contributing
 
--- Work In Progress Page --
+#### These are the colors used for GitHub Dark
+
+### Main
+
+- Body Color: #1a2632
+- Accent Color: #243447
+- Depth Color: #151f29
+- Border Color: #304251
+- Link Color: #03A9F4
+- Icon Color: #8899a6
+
+### Text
+
+- Primary Color: #ffffff
+- Seconday Color: #607d8b
+- Code Blob Color: #537698