Update 'README.md'

README.md

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 # py-dir-watcher
+1. Copy a directory to a backup location.
+2. Check for changes in original directory's file content.
+3. Replace with the original file content if changes are found.
 
+## Cloner
+- `target` is the directory to clone
+- `backup` is the backup directory
+- `interval` is the interval which the script check for changes
+
+## How does it check for changes?
+This script check for changes by comparing md5 hash from original file and the clone file.