Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing Rules
+
+## Translations
+
+If you want to translate or contribute on existing translations please read [this discussion](https://github.com/Jeffser/Alpaca/discussions/153).
+
+## Code
+
+1) Before contributing code make sure there's an open [issue](https://github.com/Jeffser/Alpaca/issues) for that particular problem or feature.
+2) Ask to contribute on the responses to the issue.
+3) Wait for [my](https://github.com/Jeffser) approval, I might have already started working on that issue.
+4) Test your code before submitting a pull request.
+
+## Q&A
+
+### Do I need to comment my code?
+
+There's no need to add comments if the code is easy to read by itself.
+
+### What if I need help or I don't understand the existing code?
+
+You can reach out on the issue, I'll try to answer as soon as possible.
+
+### What IDE should I use?
+
+I use Gnome Builder but you can use whatever you want.
+
+### Can I be credited?
+
+You might be credited on the GitHub repository in the [thanks](https://github.com/Jeffser/Alpaca/blob/main/README.md#thanks) section of the README.