Add "Python-Kurs" (#2629)

* add "Python-Kurs"

* correction: move to courses

* add empty lines to satisfy linter

README.md

@@ -51,6 +51,7 @@ Please read [CONTRIBUTING](/CONTRIBUTING.md).
 
 ### Free Online Courses
 + [English](/free-courses-en.md)
++ [German](/free-courses-de.md)
 + [Russian](/free-courses-ru.md)
 
 

free-courses-de.md

@@ -0,0 +1,10 @@
+### Index
+
+* [Python](#python)
+
+
+### Python
+
+* [Python-Kurs (Python 2)](https://www.python-kurs.eu/kurs.php)
+* [Python-Kurs (Python 3)](https://www.python-kurs.eu/python3_kurs.php)
+