Update free-programming-playgrounds.md ()

* Update free-programming-playgrounds.md

Added a few C++ playgrounds to the list

* Update free-programming-playgrounds.md

Placed the links in alphabetical order. I mistakenly didn't do this in my initial PR.
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@ -52,6 +52,8 @@
### <a name="cpp"></a>C++ ### <a name="cpp"></a>C++
* [LabStack](https://code.labstack.com/cpp)
* [OnlineGDB](https://www.onlinegdb.com/online_c++_compiler)
* [SoloLearn](https://code.sololearn.com/cpp) * [SoloLearn](https://code.sololearn.com/cpp)