Update README to point to places where hardware drivers can be obtai…

…ned.

README.md

@@ -18,6 +18,10 @@ The package is installed with:
 python3 setup.py install
 ```
 
+The backend for TaborAWGs requires packages that can be found [here](https://git.rwth-aachen.de/qutech/python-TaborDriver).
+
+The data acquisition backend for AlazarTech cards needs a package that unfortunately is not open source (yet). If you need it or have questions contact <simon.humpohl@rwth-aachen.de>.
+
 The optional script *tests/utils/syntax_check.py* invokes pyflakes to perform a static code analysis, so pyflakes should be installed if its usage is intended.
 
 ## Documentation