chore(pkg-py): Update README with install instructions and links

Author: gadenbuie

pkg-py/README.md

@@ -1,6 +1,20 @@
 # querychat for Python
 
-Please see the package documentation site for installation, setup, and usage.
+Please see [the package documentation site](https://posit-dev.github.io/querychat/py/index.html) for installation, setup, and usage.
 
 If you are looking for querychat python examples,
 you can find them in the `examples/` directory.
+
+## Installation
+
+You can install the package from PyPI using pip:
+
+```bash
+pip install querychat
+```
+
+Or you can install querychat directly from GitHub:
+
+```bash
+pip install "querychat @ git+https://github.com/posit-dev/querychat"
+```