chore: Add markdown files

CHANGELOG.md

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+# 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/),  
+and this project adheres to [Semantic Versioning](https://semver.org/).
+
+---
+
+## [Unreleased]
+
+### Added
+- Initial setup of OpenTofu project structure
+- Providers for Proxmox, Omada, GitHub
+- PostgreSQL backend support
+- GitHub Actions CI/CD workflow with `init`, `fmt`, `validate`, `plan`, and `apply`
+- Secure secrets handling via `terraform.auto.tfvars`
+
+### Changed
+- N/A
+
+### Removed
+- N/A
+
+---
+
+## [0.1.0] - 2025-09-27
+
+### Added
+- First working pipeline applying infrastructure automatically on `main`
+- Docker VM definition (`docker.tf`)
+- GitHub repo/org configuration (`github.tf`)
+- Omada networking definitions (`omada.tf`)
+- Provider and backend config (`provider.tf`)