docs: add PyPI badge and installation

Author: jaisw7

README.md

@@ -1,9 +1,17 @@
 # NanoCLI
 
+[![PyPI version](https://badge.fury.io/py/nanocli.svg)](https://pypi.org/project/nanocli/)
+
 A cli framework with the simplicity of argparse, the colors of rich, the config handling of Hydra, and without the complexity.
 
 ![NanoCLI Demo](assets/demo.gif)
 
+## Installation
+
+```bash
+pip install nanocli
+```
+
 ## Core Model
 
 ```text