Added Terminus (#10334)

* Added Terminus

* Fix: Switching the Category

more/free-programming-playgrounds.md

@@ -2,6 +2,7 @@
 
 * [APL](#apl)
 * [Assembly](#assembly)
+* [Bash](#bash)
 * [C](#c)
 * [C#](#csharp)
 * [C++](#cpp)
@@ -65,6 +66,11 @@
 * [OverTheWire](https://overthewire.org) - OverTheWire
 
 
+### Bash
+
+* [Terminus](https://web.mit.edu/mprat/Public/web/Terminus/Web/main.html) - MIT
+
+
 ### <a id="c"></a>C
 
 * [InterviewBit - Online C Compiler IDE](https://www.interviewbit.com/online-c-compiler/)