Initial commit: OpenRA game engine

Fork from OpenRA/OpenRA with one-click launch script (start-ra.cmd)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CONTRIBUTING.md

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+# OpenRA Contributing Guidelines
+
+## Participating
+Help us keep OpenRA open and inclusive. Please read and follow our [Code of Conduct](https://github.com/OpenRA/OpenRA/blob/bleed/CODE_OF_CONDUCT.md).
+
+## Bug reports
+
+* Have you read the [FAQ](https://github.com/OpenRA/OpenRA/wiki/FAQ)?
+* Add the appropriate log files on crashes.
+* Mention the version you have tested against.
+* Please be specific on how to reproduce the problem.
+* Do not submit duplicate issues. Search first.
+* Avoid including multiple requests/bugs into a single issue.
+
+## Patches
+
+* [Coding standard](https://github.com/OpenRA/OpenRA/wiki/Coding-Standard)
+* [Branches and Releases](https://github.com/OpenRA/OpenRA/wiki/Branches-and-Releases)
+* [Licensing](https://www.gnu.org/licenses/quick-guide-gplv3.html)
+
+Please `git rebase` to the latest revision of the bleed branch.
+
+Don't forget to add yourself to [AUTHORS](https://github.com/OpenRA/OpenRA/blob/bleed/AUTHORS).
+
+Please propose a [CHANGELOG](https://github.com/OpenRA/OpenRA/wiki/CHANGELOG) entry in the pull-request comments.
+
+While your pull-request is in review it will be helpful if you join [Discord](https://discord.openra.net) or [IRC](ircs://irc.libera.chat:6697/openra) to discuss the changes.
+
+See also the in-depth guide on [contributing](https://github.com/OpenRA/OpenRA/wiki/Contributing) to the OpenRA project.