Add initial changelog for v0.1.0

docs/CHANGELOG.md

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+# docs/CHANGELOG.md
+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).  
+This project adheres to [Semantic Versioning](https://semver.org/).
+
+---
+
+## [0.1.0] - 2025-11-04
+### Added
+- Initial release of **Video Tools CLI**
+- `convert-single` command:
+  - Converts a single input file (AVI, MPG, MKV, MOV, etc.) into MP4
+  - Uses FFmpeg with modern compression (`libx264`, `AAC`, CRF 18)
+  - Automatically corrects timestamps (`-fflags +genpts`)
+  - Outputs to `~/Videos`
+- `convert-multiple` command:
+  - Merges multiple video inputs into one MP4
+  - Re-encodes using same compression settings
+  - Creates and cleans temporary file lists automatically
+- Config system (`config/config.json`) with optional `jq` parsing
+- Version tracking via `VERSION` file
+- Color-coded CLI feedback for INFO, WARN, ERROR, OK
+- Graceful error handling with safe exits and cleanup
+- Compatible with:
+  - Linux (bash/zsh/fish shells)
+  - Windows (via Git Bash or WSL)
+
+### Documentation
+- `docs/README.md` — general usage and installation guide  
+- `docs/CLI_Functions.md` — detailed command reference  
+- `docs/Conversion_Settings.md` — technical breakdown of FFmpeg defaults  
+- `docs/Upscale.md` — planned module outline for future upscaling support  
+
+### Build System
+- `Makefile` with:
+  - `install` / `uninstall` / `verify` / `docs` / `help` targets
+  - Version-aware output and FFmpeg dependency check
+  - Installs both binary and documentation to system paths
+
+---
+
+## Planned for [0.2.0]
+### Added
+- `upscale-video` command:
+  - FFmpeg `lanczos` scaling for 720p / 1080p / 4K
+  - Optional H.265 (HEVC) encoding for smaller files
+- `convert-batch` for folder-wide conversions
+- JSON-driven override for per-run configuration (custom CRF, bitrate, etc.)
+- Optional parallel encoding support
+- Automatic codec detection before re-encoding
+
+### Improvements
+- More detailed progress bar during FFmpeg execution
+- Unified cross-platform installer for Windows (PowerShell script)
+- Expanded error handling and logging to `logs/` directory
+
+---
+
+
+End of File