docs(contribution): added contribution guidelines

Author: sudkumar

CONTRIBUTING.md

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+## Welcome
+
+Thank you. Your contribution is much appreciated in making this a better project for users.
+
+Here is how you can contribute.
+
+### Bug Reporting
+
+If you have found a bug in the project, please do report. Create a new issue and provide
+all the information and context regarding the bug. And if you know the fix, please create
+a pull request.
+
+### New Feature Request
+
+If you think a new feaure will improve the project's usage, please provide your suggestions.
+Create a new issue and outline the feature description and its usage.
+If you know how to implement it, please create a pull request with your feature development.
+
+### Pull Requests
+
+To help maintainers understand your contribution, please follow these step for any kind contribution:
+
+- Explain the need of your contribution in a new issue
+  - If this is a bug fix, please provide a failing test case
+- After maintainers agree that it can be a valuable contribution, fork and create a pull request with your changes
+- Pull request will be reviewed and merged as soon as possible if following these guidelines
+