Update README.md

Author: supriyar

README.md

@@ -6,7 +6,12 @@ The torchao package contains apis and workflows used to apply AO techniques like
 
 ## Installation
 
-clone repository and install package:
+1. From PyPI:
+```
+pip install torchao
+```
+
+2. From source:
 
 ```
 git clone https://github.com/pytorch-labs/ao