add: git filter hint to README.md

README.md

@@ -30,3 +30,12 @@ to know some of the internals or like to consult further documentation.
 
 ### List of Linux specific dependancies
   * libnl3
+
+## contributing
+Prior to commiting, make sure that you set up the pot date filter.
+You can do so by issuing the following commands:
+
+```
+git config filter.clean_pot.clean $(pwd)/scripts/clean_pot.sh
+git config filter.clean_pot.smudge $(pwd)/scripts/clean_pot.sh
+```