Merge pull request #604 from Nidhirajput1301/my-contribution

Update programming-language-resources.md

programming-language-resources.md

@@ -14,6 +14,7 @@
     - [STL Cheat Sheet](https://github.com/jwasham/coding-interview-university/blob/master/extras/cheat%20sheets/STL%20Quick%20Reference%201.29.pdf)
     - basics
     - pointers
+    - class and object
     - functions
     - references
     - templates