Add CHANGELOG

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [0.1.0] - 2026-07-08
+
+### Added
+- Initial release
+- `mt5bridge` CCXT Exchange class wrapping MT5Bridge HTTP API
+- Support for: `fetch_status`, `fetch_markets`, `fetch_ticker`, `fetch_ohlcv`,
+  `fetch_balance`, `fetch_positions`, `fetch_open_orders`, `fetch_my_trades`,
+  `create_order`
+- Async `cancel_order` via GlobalVariable commands + MQL5 helper EA
+- `Mql5Bridge` helper class for reading MQL5 GlobalVariables
+- Alpha Trend indicator signal reader (`alpha_trend_signal`)
+- Custom timeframe conversion (1m, 5m, 15m, 30m, 1h, 4h, 1d)
+- Symbol conversion utilities (CCXT `<->` MT5 format)
+- MQL5 helper EA (`Mt5BridgeHelper.mq5`) for async cancel/modify/close
+- Comprehensive test suite with `responses` mocks
+- Examples: basic usage, MA crossover strategy, Freqtrade config, MQL5 reader
+- Type hints throughout
+- Full documentation in README