📝 Add initial documentation about repo

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).
+
+## [Unreleased]

README.md

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+# GitHub Repo Template
+
+![License](https://img.shields.io/github/license/rmarting/gh-repo-template?style=plastic)
+![Main Lang](https://img.shields.io/github/languages/top/rmarting/gh-repo-template)
+![Languages](https://img.shields.io/github/languages/count/rmarting/gh-repo-template)
+![Last Commit](https://img.shields.io/github/last-commit/rmarting/gh-repo-template)
+
+This repository includes a set of items to be used as template for any GitHub repository, getting
+the most powerful tools and benefits from the GitHub's services.
+
+Some of the items registered here are:
+
+* Badges
+* GitHub Workflows
+
+## Badges
+
+Samples including in this readme file:
+
+```markdown
+![License](https://img.shields.io/github/license/rmarting/gh-repo-template?style=plastic)
+![Main Lang](https://img.shields.io/github/languages/top/rmarting/gh-repo-template)
+![Languages](https://img.shields.io/github/languages/count/rmarting/gh-repo-template)
+![Last Commit](https://img.shields.io/github/last-commit/rmarting/gh-repo-template)
+```
+
+More details [here](https://blog.jromanmartin.io/2023/06/12/Improving-a-gh-repository.html) and in
+the services provided by [Shields](https://shields.io/).
+
+## GitHub Workflows
+
+### Release Drafter
+
+Workflows for automatic publishing releases and update changelogs.
+
+More details [here](https://blog.jromanmartin.io/2023/06/12/Improving-a-gh-repository.html).