Added New Compiler Resource to C++ (#6664)

* Added New Compiler Resource to C++

Updated a C++ online compiler list with a free and easy to to use online resource.

* Updated the link.

more/free-programming-playgrounds.md

@@ -69,6 +69,7 @@
 ### <a name="cpp"></a>C++
 
 * [Coding Minutes](https://ide.codingminutes.com)
+* [InterviewBit](https://www.interviewbit.com/online-cpp-compiler/)
 * [LabStack](https://code.labstack.com/cpp)
 * [OnlineGDB](https://www.onlinegdb.com/online_c++_compiler)
 * [SoloLearn](https://code.sololearn.com/cpp)