added changelog

Author: alaa-eddine

CHANGELOG.md

@@ -0,0 +1,39 @@
+# 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/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [0.5.0] - 2025-12-17 (first public release)
+
+### Added
+
+-   **Core Charting Engine**
+
+    -   High-performance Candlestick (OHLCV) charts built on Apache ECharts.
+    -   Efficient incremental data updates for real-time trading applications.
+    -   Multi-pane layout system allowing stacked indicators with independent Y-axes.
+    -   Support for overlay indicators on the main price chart.
+    -   Integrated zoom and pan controls (DataZoom) with configurable positioning.
+
+-   **Interactive Drawing System**
+
+    -   A plugin architecture for extending chart functionality.
+    -   **Line Tool**: Draw trend lines, support/resistance, and rays.
+    -   **Fibonacci Retracement**: Interactive tool with customizable levels, ratios, and background shading.
+    -   **Measure Tool**: Quickly calculate price percentage changes and bar counts between two points.
+    -   Full drawing lifecycle management: selection, dragging, point adjustment, and deletion.
+
+-   **Layout & User Interface**
+
+    -   Dynamic pane controls: Collapse, Maximize, and Restore functionality for all chart areas.
+    -   Flexible "Databox" (Tooltip) system supporting Left Sidebar, Right Sidebar, or Floating modes.
+    -   Fullscreen support for an immersive trading experience.
+    -   Customizable theme options including colors (up/down/background), fonts, and spacing.
+
+-   **Developer Experience**
+    -   First-class TypeScript support with full type definitions.
+    -   Comprehensive Event API for tracking user interactions (clicks, hovers, zooms).
+    -   Modular internal architecture (LayoutManager, SeriesBuilder, GraphicBuilder).
+    -   Automated documentation workflows via GitHub Actions.

package.json

@@ -1,6 +1,6 @@
 {
     "name": "@qfo/qfchart",
-    "version": "1.0.0",
+    "version": "0.5.0",
     "description": "Professional financial charting library built on Apache ECharts with candlestick charts, technical indicators, and interactive drawing tools",
     "keywords": [
         "chart",