updated README

README.md

@@ -10,7 +10,15 @@ Useful links:
 
 **Simplified build using make** 
 ```bash
-make #build c extension inplace
+$ make #build c extension inplace
+```
+
+```
+$ make help
+clean                Remove the build folder and the shared library
+debug                Build extension with debug prints and assertions
+ext                  [DEFAULT] build c extension in place
+test                 Run unit tests using pytest
 ```
 
 **Manual build**
@@ -19,19 +27,19 @@ make #build c extension inplace
 #build in place and use from the same folder
 #sometimes necessary to remove build folder and .so
 #by hand
-python setup.py build_ext --inplace
-
-
+$ python setup.py build_ext --inplace
 ```
 
+
+
 To use make sure that the .so and potentially python files are in PYTHONPATH (or installed in developer mode)
 
 ```bash
 #conda
-conda develop install . 
+$ conda develop install . 
 
 #or with pip
-pip install --editable .
+$ pip install --editable .
 ```
 
 ## Cluster file specifications