[HacktoberFest2023]: Added Compiler Explorer to C++ programming playgrounds (#10756)

* [HacktoberFest2023]: Added Compiler Explorer to C++ programming playgrounds.

* [HacktoberFest2023]: Added Compiler Explorer to C++ programming playgrounds

* [HacktoberFest2023]: Added Compiler Explorer to C++ programming playgrounds

more/free-programming-playgrounds.md

@@ -92,6 +92,7 @@
 
 * [Coding Blocks](https://ide.codingblocks.com)
 * [Coding Minutes](https://ide.codingminutes.com)
+* [Compiler Explorer](https://godbolt.org)
 * [InterviewBit](https://www.interviewbit.com/online-cpp-compiler/)
 * [LabStack](https://code.labstack.com/cpp)
 * [OnlineGDB](https://www.onlinegdb.com/online_c++_compiler)