Update README.md

prevent not found errors

Author: mikeyang01

README.md

@@ -163,6 +163,7 @@ To get started, clone the repository and install the package in development mode
 
 ```bash
 git clone --recurse-submodules git@github.com:abetlen/llama-cpp-python.git
+cd llama-cpp-python
 
 # Install with pip
 pip install -e .