Create CONTRIBUTING.md

CONTRIBUTING.md

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+If you are new to GitHub, visit the [first-contributions instructions](https://github.com/firstcontributions/first-contributions/blob/master/README.md) to learn how to contribute on GitHub.
+
+If you are new to Rust, I recommend you to go through [the book](https://doc.rust-lang.org/book).
+
+Assuming you have forked and cloned the repo locally, in order to contribute by making changes to the code follow the steps below:
+
+- Make changes to the code
+
+- Test the changes
+
+```bash
+cargo run
+
+cargo test
+```
+
+- Format code and get linting helps
+
+```bash
+cargo fmt
+
+cargo clippy
+```
+
+- Commit, push and finally create a pull request.
+
+- Don't worry if you make a mistake, we will provide constructive feedback and guidance to improve the pull request.
+
+- If you encounter any situation that violates our [code of conduct](https://github.com/sayanarijit/xplr/blob/main/CODE_OF_CONDUCT.md) or please report it to sayanarijit@gmail.com.