docs: comprehensive README with all sections

- Architecture diagram and message flow
- Installation (plugin, from source, development)
- Configuration (all fields, DM policies, group policies)
- MAX Bot API reference (send, typing, upload, keyboard, callback)
- Comparison with Telegram Bot API
- Development guide (build, test, lint)
- CI/CD and release process
- Related projects

Author: RuslanStrogov

CHANGELOG.md

@@ -0,0 +1,22 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+## [1.0.0] - 2026-06-20
+
+### Added
+- Initial release
+- MAX Bot API channel plugin for OpenClaw
+- `createChatChannelPlugin` with full OpenClaw channel architecture
+- DM security policies: pairing, allowlist, open, disabled
+- Group chat support with per-group policies
+- Outbound text messaging via MAX Bot API
+- Outbound media (images, files, audio) via MAX upload API
+- Inline keyboard support (callback buttons)
+- Typing indicator via heartbeat
+- HMAC-SHA256 webhook signature verification
+- Config adapter for OpenClaw setup flow
+- TypeScript source with compiled JS output
+- CI pipeline (GitHub Actions)
+- Release automation (GitHub Release)
+- Unit tests with Vitest