fix(docs): Update development instructions (abetlen#1833)

Author: Florents-Tselai

README.md

@@ -752,15 +752,29 @@ pip install --upgrade pip
 pip install -e .
 
 # if you want to use the fastapi / openapi server
-pip install -e .[server]
+pip install -e '.[server]'
 
 # to install all optional dependencies
-pip install -e .[all]
+pip install -e '.[all]'
 
 # to clear the local build cache
 make clean
 ```
 
+Now try running the tests
+
+```bash
+pytest
+```
+
+There's a `Makefile` available with useful targets.
+A typical workflow would look like this:
+
+```bash
+make build
+make test
+```
+
 You can also test out specific commits of `llama.cpp` by checking out the desired commit in the `vendor/llama.cpp` submodule and then running `make clean` and `pip install -e .` again. Any changes in the `llama.h` API will require
 changes to the `llama_cpp/llama_cpp.py` file to match the new API (additional changes may be required elsewhere).