Added project-based-learning repo link to README.md (#81)

* Update README.md

Added link to project-based-learning repository which has over 116k stars

* Update README.zh_tw.md

* Update README.ko.md

* Update README.es.md

* Update README.de.md

Author: Azeen3003

README.de.md

@@ -133,6 +133,7 @@ Lernen Sie weiter, indem Sie von anderen Quellen lesen.
 - [ZuzooVn/machine-learning-for-software-engineers](https://github.com/ZuzooVn/machine-learning-for-software-engineers)
 - [30-seconds/30-seconds-of-python](https://github.com/30-seconds/30-seconds-of-python) (:test_tube:)
 - [ml-tooling/best-of-python](https://github.com/ml-tooling/best-of-python)
+- [practical-tutorials/project-based-learning](https://github.com/practical-tutorials/project-based-learning#python)
 
 ### Interaktive Übungen
 

README.es.md

@@ -132,6 +132,7 @@ Sigue aprendiendo leyendo otros buenos recursos.
 - [ZuzooVn/machine-learning-for-software-engineers](https://github.com/ZuzooVn/machine-learning-for-software-engineers)
 - [30-seconds/30-seconds-of-python](https://github.com/30-seconds/30-seconds-of-python) (:test_tube:)
 - [ml-tooling/best-of-python](https://github.com/ml-tooling/best-of-python)
+- [practical-tutorials/project-based-learning](https://github.com/practical-tutorials/project-based-learning#python)
 
 ### Práctica interactiva
 

README.ko.md

@@ -121,6 +121,7 @@ Repl.it와 같은 브라우저에서 실행할 수있는 독립형 모듈 모음
 - [ZuzooVn/machine-learning-for-software-engineers](https://github.com/ZuzooVn/machine-learning-for-software-engineers)
 - [30-seconds/30-seconds-of-python](https://github.com/30-seconds/30-seconds-of-python) (:test_tube:)
 - [ml-tooling/best-of-python](https://github.com/ml-tooling/best-of-python)
+- [practical-tutorials/project-based-learning](https://github.com/practical-tutorials/project-based-learning#python)
 
 ### 대화 형 연습
 

README.md

@@ -134,6 +134,7 @@ Keep learning by reading from other well-regarded resources.
 - [ZuzooVn/machine-learning-for-software-engineers](https://github.com/ZuzooVn/machine-learning-for-software-engineers)
 - [30-seconds/30-seconds-of-python](https://github.com/30-seconds/30-seconds-of-python) (:test_tube:)
 - [ml-tooling/best-of-python](https://github.com/ml-tooling/best-of-python)
+- [practical-tutorials/project-based-learning](https://github.com/practical-tutorials/project-based-learning#python)
 
 ### Interactive practice
 

README.zh_tw.md

@@ -117,6 +117,7 @@ print("Ultimate Python 學習大綱")
 - [ZuzooVn/machine-learning-for-software-engineers](https://github.com/ZuzooVn/machine-learning-for-software-engineers)
 - [30-seconds/30-seconds-of-python](https://github.com/30-seconds/30-seconds-of-python) (:test_tube:)
 - [ml-tooling/best-of-python](https://github.com/ml-tooling/best-of-python)
+- [practical-tutorials/project-based-learning](https://github.com/practical-tutorials/project-based-learning#python)
 
 ### 互動練習