Added CONTRIBUTING.md for a detailed contribution guide.

CONTRIBUTING.md

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+
+## Contributing
+
+Contributions are welcome and always appreciated!
+
+Do keep in mind before you start working on an issue / posting a PR:
+- Search existing PRs related to that issue which might close them
+- Confirm if other contributors are working on the same issue
+
+## Run Locally
+Ensure you have the following dependencies installed:
+- Install `node` and `yarn`
+- Configure your IDE to support ESLint and Prettier extensions.
+
+After having above installed, proceed through the following steps to setup the codebase locally.
+
+- Fork the project & [clone](https://docs.github.com/en/repositories/creating-and-managing-repositories/cloning-a-repository) it locally.
+
+![fork-project](https://github.com/responsively-org/responsively-app/assets/87022870/2cae8b2a-850c-4f80-8ede-32eba622a854)
+
+- Create a new separate branch.
+
+```bash
+git checkout -b BRANCH_NAME
+```
+- Go to the desktop-app directory.
+
+```bash
+cd desktop-app
+```
+
+- Run the following command to install dependencies inside the desktop-app directory.
+
+```bash
+yarn
+```
+
+- This will start the app for local development with live reloading.
+
+```bash
+yarn dev
+```
+
+## Running Tests
+
+It is crucial to test your code before submitting a pull request. Please ensure that you can make a complete production build before you submit your code for merging.
+
+- Build the project
+```bash
+yarn build
+```
+
+- Now test your code using the following command
+```bash
+yarn test
+```
+
+Make sure the tests have successfully passed. 
+
+## Pull Request
+
+🎉 Now that you're ready to submit your code for merging, there are some points to keep in mind.
+
+- Fill your PR description template accordingly.
+    - Have an appropriate title and description.
+    - Include relevant screenshots/gifs.
+
+- If your PR fixes some issue, be sure to add this line with the issue **in the body** of the Pull Request description.
+```text
+Fixes #00000
+```
+
+- If your PR is referencing an issue
+```text
+Refs #00000
+```
+
+- Ensure that "Allow edits from maintainers" option is checked.
+
+## Community
+Need help on a solution from fellow contributors or want to discuss about a feature/issue? 
+
+Join our [Discord](https://responsively.app/join-discord)!