some readme

README.md

@@ -34,14 +34,26 @@ wrapper.
   - eFloat32Usi: 32 byte
   - eFloat64Usi: 64 byte
 - main.cpp contains an example of how the C++ library might be used to provide
-  the channels and groups of the dataset.
+  the channels and groups of the dataset. It is simply build by
+
+  ```Shell
+  make
+  ```
 - extract_all.cpp takes the .tdm, the .tdx file and some output directory as arguments
   to provide all given information in .csv format without any logging.
 
+  ```Shell
+  make extall
+  ```  
+
 ### Python module
 
 - The library may also be used as a Python module and supports the use of
   group channels in NumPy arrays as shown in example.py .
 - To extract all available information and data in the TDM files without any
   further interaction, the use of extract_all.py is recommended. To exhibit the
-  required arguments call $ python extract_all.py --help .
+  required arguments:
+
+  ```Shell
+  python extract_all.py --help
+  ```