Create Contribution.md

I have created the contribution doc . @kshitijrajsharma , @omranlm and @petya-kangalova please review it.

docs/Contribution.md

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+## :hugs: Welcome
+
+:+1::tada: First off, I'm really glad you're reading this, because we need volunteer developers to help improve the fAIr! :tada::+1:
+
+We welcome and encourage contributors of all skill levels and we are committed to making sure your participation is inclusive, enjoyable and rewarding. If you have never contributed to an open source project before, we are a good place to start and will make sure you are supported every step of the way. If you have **any** questions, please ask!
+
+There are many ways to contribute to this repo:
+
+## Testing
+
+Adding test cases, or simply testing out existing functionality.
+
+## Report bugs and suggest improvements
+
+The [issue queue](https://github.com/hotosm/fAIr/issues) is the best way to get started. There are issue templates for BUGs and FEATURES that you can use, or you can create your own. Once you have submitted an issue, it will be assigned one label out of the following [label categories](https://github.com/hotosm/fAIr/labels). If you are wondering where to start, you can filter by the GoodFirstIssue label.
+
+## Code contributions
+
+Create pull requests (PRs) for changes that you think are needed. We would really appreciate your help!
+
+## Documentation contributions 
+
+Create pull requests (PRs) for changes that you think are needed to the documentation of fAIr.As of now you can find the documentation work at the [docs](https://github.com/hotosm/fAIr/tree/master/docs) directory.
+
+
+## :handshake: Thank you
+
+Thank you very much in advance for your contributions!! Please ensure you refer to our [Code of Conduct](https://github.com/hotosm/fAIr/blob/master/docs/Code-of-Conduct.md).
+If you've read the guidelines, but you are still not sure how to contribute on Github, please reach out to us via our Slack #geospatial-tech-and-innovation.