Add initial documentation and structure for DorkNet project

- Create README.md for project overview and setup instructions
- Add admin-ui/README.md for admin UI details and development setup
- Introduce client-mod/README.md explaining the MelonLoader mod functionality
- Establish docker/README.md for Docker setup and configuration
- Create docs/README.md to index project documentation
- Implement advanced-setup.md for Docker stack configuration
- Document architecture in architecture.md
- Provide easy-setup.md for hosting instructions
- Add FAQ.md for common questions and legal considerations
- Create joining-a-server.md for player connection instructions
- Establish troubleshooting.md for common issues and resolutions
- Introduce easy-app/README.md for the unified desktop application
- Add server/README.md for ASP.NET Core backend details
- Document tools/README.md for CLI helper scripts

CONTRIBUTING.md

@@ -0,0 +1,55 @@
+# Contributing to DorkNet
+
+Thanks for your interest. A few ground rules before you open a PR.
+
+## Code style
+
+- **C#**: nullable enabled. Match the file you're editing. No regions, no
+  multi-paragraph XML docs, no async-without-await.
+- **TypeScript / React**: existing patterns — function components, named
+  exports, tailwind classes, no CSS modules. Lint with `npm run lint` from
+  `admin-ui/`.
+- **No AI-co-author trailers in commit messages.** Use a real attribution
+  line or none at all.
+
+## Branches and commits
+
+- `main` is protected; PR from a feature branch.
+- Conventional commits welcome but not required. One-line summary should
+  describe the *why*, not the *what* — the diff already shows what.
+
+## Scope of contributions we welcome
+
+- Bug fixes against documented behavior
+- Feature parity with the 2020 client (anything reverse-engineered cleanly)
+- Performance work
+- Better docs, screenshots, video walkthroughs
+- New translations of the admin UI
+
+## Scope of contributions we don't accept
+
+- **Rec Room game assets, decompiled source, or modified game binaries.**
+  We never ship Rec Room IP. See [DISCLAIMER.md](DISCLAIMER.md). PRs that
+  add these files will be closed.
+- **Cheats, exploits, or features that would harm other public Rec Room
+  servers.** This project exists to let people self-host the 2020 backend
+  for themselves; it isn't a vehicle for griefing live games.
+- **Crypto / NFT / monetization plugins.** Hard no.
+
+## Reporting security issues
+
+Don't open a public issue. Email the maintainer at the address in the repo
+metadata, or use GitHub's private vulnerability reporting.
+
+## Setting up a dev environment
+
+See [docs/advanced-setup.md](docs/advanced-setup.md) for the full server
+stack. For just hacking on the admin UI:
+
+```bash
+cd admin-ui
+npm install
+npm run dev
+```
+
+Points at `http://localhost:5000` by default — start the server first.