Adding README.md

Author: 0x-avenkar

Gettin File and Folder sizes/README.md

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+# This is a script that getting file and folders sizes
+
+# Its use argparse module to write user-friendly command-line interfaces.
+
+# also use OS module to provides functions for interacting with the operating system.
+
+# How we can use it?
+
+### python3 GettingSizes.py --help