Adding contribution guildelines

Author: gauravbehere

contributing.md

@@ -0,0 +1,8 @@
+# How to propose a change?
+- Fork the repo.
+- Create a branch from master.
+- Update readme.md (You can add more contents to the list or propose a new section).
+- Describe your change.
+- Submit a PR.
+
+PS: If you want to suggest removal of an item from the list, please raise an issue.