Create CONTRIBUTING.md

Author: sonus21

CONTRIBUTING.md

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+[![Build Status](https://circleci.com/gh/sonus21/rqueue/tree/master.svg?style=shield)](https://circleci.com/gh/sonus21/rqueue/tree/master)
+[![Coverage Status](https://coveralls.io/repos/github/sonus21/rqueue/badge.svg?branch=master)](https://coveralls.io/github/sonus21/rqueue?branch=master)
+[![Maven Central](https://img.shields.io/maven-central/v/com.github.sonus21/rqueue-core)](https://repo1.maven.org/maven2/com/github/sonus21/rqueue-core)
+[![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](LICENSE)
+
+
+
+## How to contribute to Rqueue
+
+#### **Did you find a bug?**
+
+* **Do not open up a GitHub issue if the bug is a security vulnerability in Rqueue**, and instead to refer to our [security policy](https://github.com/sonus21/rqueue/blob/master/SECURITY.md).
+
+* **Ensure the bug was not already reported** by searching on GitHub under [Issues](https://github.com/sonus21/rqueue/issues).
+
+* If you're unable to find an open issue addressing the problem, [open a new one](https://github.com/sonus21/rqueue/issues/new). Be sure to include a **title and clear description**, as much relevant information as possible, and a **code sample** or an **executable test case** demonstrating the expected behavior that is not occurring.
+
+* If possible, use the relevant bug report [templates](https://github.com/sonus21/rqueue/issues/new?assignees=sonus21&labels=&template=bug-report.md&title=) to create the issue
+
+#### **Did you write a patch that fixes a bug?**
+
+* Open a new GitHub pull request with the patch.
+
+* Ensure the PR description clearly describes the problem and solution. Include the relevant issue number if applicable.
+
+
+#### **Did you fix whitespace, format code, or make a purely cosmetic patch?**
+
+Changes that are cosmetic in nature and do not add anything substantial to the stability, functionality, or testability of Rqueue will generally not be accepted.
+
+#### **Do you intend to add a new feature or change an existing one?**
+
+* Breaking changes are not allowed generally
+* You're welcome for any pull rqueuest for any new features.
+
+
+Thanks! :heart: :heart: :heart: