Add initial CONTRIBUTING.md

CONTRIBUTING.md

@@ -0,0 +1,26 @@
+# Contributing to TEAMMATES
+
+Contributions are very welcomed.
+But do ensure that you have conformed to the following:
+- Best practices for: [UI design][ui], [Coding][code], [Testing][test]
+- Coding standards for: [Java][java], [JSP][jsp], [JavaScript][js], [CSS][css], [HTML][html]
+- [TEAMMATES Development Process][dev] (including naming conventions for commits and pull request, etc.)
+
+[ui]: https://docs.google.com/document/d/1Vj59--sCYUfxgg-iLI53hMfc6YY1gguATTN_KXTQVUo/pub?embedded=true
+[code]: https://docs.google.com/document/d/14EFJzdhp10qQ9iZ-FwsS1FAf42voe4exrlbefo_zYaU/pub?embedded=true
+[test]: https://docs.google.com/document/d/1aK-1ubIA59fbNsEujwvWKqx7itwLPTD6mzFo4F_oEoI/pub?embedded=true
+
+[java]: https://docs.google.com/document/pub?id=1iAESIXM0zSxEa5OY7dFURam_SgLiSMhPQtU0drQagrs&embedded=true
+[jsp]:https://docs.google.com/document/d/14bXfdveXvoIaPBYpL19m4PK6oPabSnnoawj6OGjOzD4/pub?embedded=true
+[js]: https://docs.google.com/document/d/1gZ6WG6HBTJYHAtVkz9kzi_SUuzfXqzO-SvFnLuag2xM/pub?embedded=true
+[css]: https://docs.google.com/document/d/1wA9paRA9cS7ByStGbhRRUZLEzEzimrNQjIDPVqy1ScI/pub
+[html]: https://docs.google.com/document/d/12PJYbQoqjK-0LzaUuguQ4kGE--eikCcHfwzZDGwFOJ0/pub?embedded=true
+
+[dev]: https://github.com/TEAMMATES/teammates/blob/master/devdocs/process.md
+
+### Other Resources
+If you are just starting out, do refer to the [Contributor's Orientation Guide][COG].  
+For a comprehensive directory of resources, please refer to [README.md][readme].
+
+[cog]: https://docs.google.com/document/d/1cY9pmEmw4dC6Z4LjN1WUTsynJ0jVPgbWsFhdyBy_wCU/pub?embedded=true
+[readme]: https://github.com/TEAMMATES/teammates/blob/master/README.md