chore(contribute): add CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing to veggies
+
+Find veggies useful and want to get involved? Thanks!
+There are plenty of ways you can help.
+
+Please take a moment to review this document in order to make
+the contribution process easy and effective for everyone involved.
+
+Following these guidelines helps to communicate that you respect
+the time of the developers managing and developing this open source project.
+In return, they should reciprocate that respect in addressing your issue or assessing patches and features.
+
+## Setting Up a Local Copy
+
+1. Clone the repo with `git clone https://github.com/ekino/veggies`
+
+2. Run `yarn install` in the root `veggies` folder.
+
+Once it is done, you can modify any file locally and run `yarn run examples start` or `yarn test` to check it.
+
+## Submitting a Pull Request
+
+Good pull requests, such as patches, improvements, and new features, are a fantastic help.
+They should remain focused in scope and avoid containing unrelated commits.
+
+Please **ask first** if somebody else is already working on this or the core developers think your feature is in-scope for veggies.
+Generally always have a related issue with discussions for whatever you are including.
+
+Please also provide a **test plan**, i.e. specify how you verified that your addition works.
+
+