Added an android book and a Python playground (#4156)

* Add javatpoint android free tutorial

* add python playground

* Add interactive new Android tutorial section

javatpoint android tutorial

* del prev change

* change python playground title

free-programming-interactive-tutorials-en.md

@@ -1,6 +1,7 @@
 ### Index
 
 * [Ada](#ada)
+* [Android](#android)
 * [Bash](#bash)
 * [C](#c)
 * [C#](#c-sharp)
@@ -39,6 +40,11 @@
 * [Introduction to Ada](https://learn.adacore.com/courses/intro-to-ada/index.html)
 
 
+### Android
+
+* [Javatpoint Android Tutorial](https://www.javatpoint.com/android-tutorial)
+
+
 ### Bash
 
 * [Help messages will explain everything](https://explainshell.com)

free-programming-playgrounds.md

@@ -153,6 +153,7 @@
 * [Codepad](http://codepad.org)
 * [Python Trinket](https://trinket.io/python)
 * [Python.org Shell](https://www.python.org/shell)
+* [Repl.it - NiceDualPoin](https://repl.it/repls/NiceDualPoint#main.py)
 
 
 ### R