Add changelog for v1.0.0

Author: AlejandroDiazD

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.  
+This project adheres to [Semantic Versioning](https://semver.org/).
+
+---
+
+## [Unreleased]
+
+### Added
+- (placeholder for upcoming features)
+
+---
+
+## [v1.0.0] - 2025-11-02
+
+### Added
+- Initial Streamlit dashboard structure  
+- Modular architecture (`modules/data`, `modules/analysis`, `modules/visualization`, `modules/ui`)
+- Real-time data via Yahoo Finance (`yfinance`)
+- Linear regression forecasting
+- RSI and SMA (20/50) indicators
+- Asset selector covering indices, commodities, crypto, bonds, and ETFs
+- Plotly visualizations (candlestick, RSI, forecast)
+- User Guide tab
+- README, LICENSE (MIT), and .gitignore
+
+### Fixed
+- None (initial release)
+
+### Changed
+- None (initial release)
+
+### Removed
+- None (initial release)