Create CONTRIBUTING.md (#34)

Author: vrcprl

CONTRIBUTING.md

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+# CONTRIBUTING.md
+
+Thank you for contributing to Replexica! We’re an exciting open source project and we’d love to have you contribute! Here’s some resources and guidance to help you get started:
+
+[1. Issues](#issues)
+[2. Pull Requests](#pull-requests)
+
+## Issues
+
+If you find a bug, please create an Issue and we’ll triage it.
+
+- Please search [existing Issues](https://github.com/replexica/replexica/issues) before creating a new one.
+- Please include a clear description of the problem along with steps to reproduce it. Exact steps with screenshots and urls really help here.
+
+## Pull Requests
+
+We actively welcome your Pull Requests! A couple of things to keep in mind before you submit:
+
+- If you’re fixing an Issue, make sure someone else hasn’t already created a PR fixing the same issue. Likewise, make sure to link your PR to the related Issue(s).
+- We will always try to accept the first viable PR that resolves the Issue.