Add contributing.md document (#15)

Add Contributing.md document

Author: kruczyna

CONTRIBUTING.md

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+# Cloud-Pine is an OPEN Open Source Project
+
+Thank you for taking an interest in contributing to Cloud-Pine! No
+contribution is too small :)
+This guide is an attempt to standardize the flow and to help you make a contribution.
+
+## Where do I start?
+
+1. **Code improvements**: Take a look at our Issues tab, especially the [help wanted](https://github.com/metcoder95/cloud-pine/issues?q=is%3Aissue+is%3Aopen+label%3A%22help+wanted%22) label
+2. **Documentation improvements**: Go through our documentation and search for small typo corrections to major document reworks
+3. **Open issue**: Report an error you can’t solve yourself, discuss a high-level topic or idea, propose a new feature or other project idea 🙌
+
+## Ground Rules
+
+1. If you open a pull request, please ensure that your contribution passes all tests. If there are test failures, you will need to address them before we can merge your contribution.
+2. Please be respectful, kind and thoughtful. Behind the screen are human beings with their own beautiful history.
+
+## How to contribute?
+
+1. Fork the cloud-pine repository. More detailed information can be found [here](https://docs.github.com/en/get-started/quickstart/fork-a-repo)
+2. Open and [configure](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/working-with-forks/configuring-a-remote-for-a-fork) your newly forked repository
+3. Create a new branch in the forked repository
+4. Make some changes ✨✨✨
+5. Commit your changes with a meaningful description
+6. Push out your changes
+7. Create a pull request!
+8. ... and wait for review :)
+
+... see you in the PR!