Add contributing guide

CONTRIBUTING.md

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+## How to contribute to this project
+
+#### **Did you find a bug?**
+
+* **Ensure the bug was not already reported** by searching on GitHub under [Issues](https://github.com/lncm/thebox-compose-system/issues).
+
+* If you're unable to find an open issue addressing the problem, [open a new one](https://github.com/lncm/thebox-compose-system/issues/new). Be sure to include a **title and clear description**, as much relevant information as possible, and try to include a **code sample** or an **executable test case** demonstrating the expected behavior that is not occurring.
+
+#### **Did you write a patch that fixes a bug?**
+
+* Open a new GitHub pull request with the patch.
+
+* Ensure the PR description clearly describes the problem and solution. Include the relevant issue number if applicable.
+
+* If you haven't done a test build yet, please mention this in the pull request. This will save a world of pain for future builds. There is no regression testing suite set up yet but this is something that we're looking into. Contributions are welcome.
+
+#### **I'm not a developer, what can I do to help?**
+
+We could definetely use some UX, QA or Build Systems support on this project. See getting in touch below or just [create an issue](https://github.com/lncm/thebox-compose-system/issues/new) and tag it with question.
+
+Or if you just want to donate some money please use [**bc1qsdlppqy9mhah5ljmhcmtpl20n9km8jz45n3qx3les3q2qfzpwm7qnruqnq**](https://blockchair.com/bitcoin/address/bc1qsdlppqy9mhah5ljmhcmtpl20n9km8jz45n3qx3les3q2qfzpwm7qnruqnq) or feel free to use [**Lightning via tippin.me**](https://tippin.me/@lncnx) .
+
+#### **Getting in touch**
+
+We accept contributions of all kinds, please contact us on [Twitter](https://twitter.com/lncnx) or contact one of us directly on Wire Messenger (userid: @corv , @nolim1t, or @meeDamian)
+
+Main Repository Maintainer: [@nolim1t](https://github.com/nolim1t)
+