Create CONTRIBUTING.md (#69)

* Create CONTRIBUTING.md

CONTRIBUTING.md

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+# How to contribute
+
+I'm really glad you're reading this, because we need volunteer developers to help this project grow.
+
+
+#### **Did you find a bug?**
+
+* **Do not open up a GitHub issue if the bug is a security vulnerability**, and instead to refer to our [security policy](./SECURITY.md).
+
+* **Ensure the bug was not already reported** by searching on GitHub under [Issues](https://github.com/ramank775/chat-server/issues).
+
+* If you're unable to find an open issue addressing the problem, [open a new one](https://github.com/ramank775/chat-server/issues/new). 
+   Be sure to include a **title and clear description**, as much relevant information as possible.
+
+#### **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.
+
+#### **Do you intend to add a new feature or change an existing one?**
+
+* Suggest your change in [Ideas in discussion](https://github.com/ramank775/chat-server/discussions/categories/ideas). 
+* Once approved [open a new issue](https://github.com/ramank775/chat-server/issues/new) and start writing code.
+
+#### **Do you have questions?**
+
+* Ask any question about the project on [Q&A in discussion](https://github.com/ramank775/chat-server/discussions/categories/q-a).
+
+Thanks! :heart: :heart: :heart:
+
+Raman