Добавить двуязычную документацию (русский и английский) (#1101)

docs/EN/CONTRIBUTING.md

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+# CONTRIBUTING
+
+Thank you for wanting to help the `tg-ws-proxy` project.
+
+## Before Creating an Issue
+
+1. Check the documentation in `docs/README.md`.
+2. Make sure a similar issue hasn't already been opened.
+3. Use standard labels from `.github/labels.md` for correct triage.
+
+## How to Report Problems
+
+- Use the `Problem` template.
+- If possible, provide:
+  - Application version,
+  - Operating system,
+  - Steps to reproduce,
+  - Expected and actual behavior,
+  - Log file or error text.
+
+The more precise your description, the faster we can help.
+
+## Local Development from Source
+
+Python `>=3.8` is required.
+
+```bash
+pip install -e .
+```
+
+Running:
+
+- console mode: `tg-ws-proxy`
+- Windows tray: `tg-ws-proxy-tray-win`
+- macOS tray: `tg-ws-proxy-tray-macos`
+- Linux tray: `tg-ws-proxy-tray-linux`
+
+Details: `docs/BuildFromSource.md`.
+
+## Pull Request
+
+Before opening a PR:
+
+1. Make sure your change solves a specific problem.
+2. Check that existing scenarios aren't broken.
+3. Update documentation if behavior or configuration changes.
+
+Smaller and focused PRs are reviewed and accepted faster.