Add CONTRIBUTING.md (photonle#4)

CONTRIBUTING.md

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+# Contributing to Photon 2
+
+## I have a question
+
+If you have a question and can't find the answer on the [Photon 2 Wiki](photon.lighting/docs), please join the [Photon 2 Discord](photon.lighting/discord) and and ask in the `#v2-discussion` channel.
+
+## I have a problem
+
+If you have an issue and can't find the answer on the [Photon 2 Wiki](photon.lighting/docs), please join the [Photon 2 Discord](photon.lighting/discord) and create a new thread in the `#v2-support` channel.
+
+## I want to request a feature
+
+Feel free to submit your ideas on the [Photon 2 Discord](photon.lighting/discord) in the `#v2-ideas` channel.
+
+## I have an error to report
+
+If you're a developer or administrator and have found an error, please [create an issue](https://github.com/photonle/Photon-v2/issues) on Github. Please include steps to reproduce the error and, if applicable, the Photon log files from `garrysmod/data/photon-v2/cl_log.txt` or `sv_log.txt`.
+
+## I want to contribute code
+
+While we generally do not need assistance with adding features or updating core functionality, code changes to make Photon 2 compatible with other addons or standards is absolutely welcome. This includes the addition of hooks or permission checks.
+
+## I want to request compatibility with something
+
+If you are an addon author or server administrator, you are welcome to request integration or compatibility with another addon on service. You may [create an issue](https://github.com/photonle/Photon-v2/issues) on Github or create a thread on the [Photon 2 Discord](photon.lighting/discord) in `#v2-support`.