docs: Add contributing

CONTRIBUTING.md

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+### Contributing
+If you are looking to contribute to the project, you may find the [**Developer Guide**](https://github.com/tjtanjin/react-chatbotify/blob/main/docs/DeveloperGuide.md) useful.
+
+In general, the forking workflow is encouraged and you may open a pull request with clear descriptions on the changes and what they are intended to do (enhancement, bug fixes etc). Alternatively, you may simply raise bugs or suggestions by opening an [**issue**](https://github.com/tjtanjin/react-chatbotify/issues) or raising it up on [**discord**](https://discord.gg/6R4DK4G5Zh).
+
+Note: Templates have been created for pull requests and issues to guide you in the process.