Add initial contribution guidelines

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
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+# Contributing Guidelines
+
+Patches and pull-requests:
+
+If you want to contribute a change to LuCI, please either send a patch using git send-email
+or open a pull request against the openwrt/luci repository.
+
+Regardless of whether you send a patch or open a pull request, please try to follow these rules:
+
+* Have a useful subject prefixed with the component name  
+    (E.g.: "modules/admin-full: fix wifi channel selection on multiple STA networks")
+* Shortly explain the changes made and - if applicable - the reasoning behind them
+* Include Signed-off-by in the comment  
+    (See <https://dev.openwrt.org/wiki/SubmittingPatches#a10.Signyourwork>)
+       
+In case you like to send patches by mail, please use the [LuCI mailinglist](https://lists.subsignal.org/mailman/listinfo/luci)
+or the [OpenWrt Development List](https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel).
+
+If you send via the OpenWrt list, include a "[luci]" tag in your subject line.
+For general information on patch submission, follow the [OpenWrt patch submission guideline](https://dev.openwrt.org/wiki/SubmittingPatches).
+
+
+If you have commit access:
+
+* Do NOT use git push --force.
+* Use Pull Requests if you are unsure and to suggest changes to other developers.
+
+Gaining commit access:
+
+* Commit access will be granted to responsible contributors who have made
+  useful pull requests and / or feedback or patches to this repository or
+  OpenWrt in general. Please include your request for commit access in your
+  next pull request or ticket.
+
+Release Branches:
+
+* Branches named "luci-X.Y" (e.g. luci-0.12) are release branches.
+* These branches are built with the respective OpenWrt release and are created
+  during the release stabilisation phase.
+* Please ONLY cherry-pick or commit security and bug-fixes to these branches.
+* Do NOT add new packages and do NOT do major upgrades of packages here.
+* If you are unsure if your change is suitable, please use a pull request.
+