Update README.md

Update readme to include some more directions on creating the venv and updating pip
This matches more closely with instructions for chia-dev-tools

README.md

@@ -3,9 +3,13 @@
 ## Setup Instructions
 - Stop any running wallet/node instances: `chia stop -d all`
 
-- Clone this repo, create/activate a new virtual environment
+- Clone this repo, create/activate a new virtual environment and update pip. Note instructions for createing the python venv may vary depending on your OS
 ```bash
 git clone https://github.com/Chia-Network/chia-nft-minting-tool.git
+cd chia-nft-minting-tool
+python3 -m venv venv
+source ./venv/bin/activate
+pip install --upgrade pip
 ```
 
 - Install chianft and the necessary chia-blockchain branch (make sure to include the '.' at the end):