Add README.md. Add setup to README.md. Add MIT license to LICENSE.md

README.md

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+# Directory Backup Script
+
+A simple script that backs up a directory to another directory, and removes old backups when over a specified limit.
+
+This script is currently used to backup git.getagripgal.nl to several backup sites over samba.
+
+## Setup
+
+```bash
+# Setup a venv (Optional)
+python -m venv .
+source bin/activate
+
+# Install the dependencies.
+python -m pip install -p requirements.txt
+
+# Run the script (After setting up the .env file.)
+python main.py
+```
+
+## Config
+The config is stored in the `.env` file.
+
+```env
+SOURCE_DIR= # The source directory to backup.
+BACKUP_DIR= # The resulting directory the backups get copied to.
+MAX_BACKUPS= # The maximum amount of backups stored at a time.
+```