README in the `project` folder is confusing

## Problem
The initial setup instructions can be misleading to someone new to AlgoKit. 
https://github.com/algorandfoundation/algokit-python-template/blob/60fddfb7e1115e32badc48f9d0c821f8c1d9ad7c/template_content/README.md.jinja#L16

## Solution
Add a sentence saying something like, "This initial setup is not required if you initialized the project yourself."
