Create CONTRIBUTING.md

Author: Extrems

CONTRIBUTING.md

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+LLM-generated contributions are not accepted. Reach a human if you don't understand what something does.
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+Please try to stick to established code styles, particularly for existing files. Nobody likes it, but it is what it is.
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+New, large components should not be added to this tree. What exists was inherited from old, pre-Git practices.
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+Please be mindful of the license of newly introduced dependencies, as it may have legal consequences for the projects using them. BSD/MIT/Zlib-type licenses are preferable, if not public domain.
+It should be possible to opt-out of any (L)GPL dependencies.