Create CONTRIBUTING.md

Author: daviddias

CONTRIBUTING.md

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+# Contributing guidelines
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+libp2p as a project, including js-libp2p and all of its modules, follows the [standard IPFS Community contributing guidelines](https://github.com/ipfs/community/blob/master/js-project-guidelines.md).
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+We also adhere to the [IPFS JavaScript Community contributing guidelines](https://github.com/ipfs/community/blob/master/js-project-guidelines.md) which provide additional information of how to collaborate and contribute in the JavaScript implementation of libp2p.
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+We appreciate your time and attention for going over these. Please open an issue on [ipfs/community](https://github.com/ipfs/community) if you have any question.
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+Thank you.