drm_hwcomposer: Add README.md
Although we had CONTRIBUTING.md, gitlab didn't really highlight it. So I tried putting this info in the wiki, but that was equally hard to discover. _then_ I thought gitlab pages was the right way to go, but no.
Turns out README.md will be harvested by gitlab and shown on the project's frontpage \o/
Signed-off-by: Sean Paul <seanpaul@chromium.org>
diff --git a/README.md b/README.md
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+drm_hwcomposer
+======
+
+Patches to drm_hwcomposer are very much welcome, we really want this to be the
+universal HW composer implementation for Android and similar platforms
+So please bring on porting patches, bugfixes, improvements for documentation
+and new features.
+
+A short list of contribution guidelines:
+* Submit changes via gitlab merge requests on gitlab.freedesktop.org
+* drm_hwcomposer is Apache 2.0 Licensed and we require contributions to follow the developer's certificate of origin: http://developercertificate.org/
+* When submitting new code please follow the naming conventions documented in the generated documentation. Also please make full use of all the helpers and convenience macros provided by drm_hwcomposer. The below command can help you with formatting of your patches:
+
+ `git diff | clang-format-diff-3.5 -p 1 -style=file`
+* Hardware specific changes should be tested on relevant platforms before committing.
+
+If you need inspiration, please checkout our [TODO issues](https://gitlab.freedesktop.org/drm-hwcomposer/drm-hwcomposer/issues?label_name%5B%5D=TODO)
+
+Happy hacking!