Updated README

Author: xKrashx

README.md

@@ -10,6 +10,7 @@
 ### [:seven: Keyword friend, Keyword mutable, Static fields and methods](https://github.com/xKrashx/Object_Oriented_Programming/tree/main/Seminar/Week%2007)
 ### [:eight: Operators, Collections of pointers to objects](https://github.com/xKrashx/Object_Oriented_Programming/tree/main/Seminar/Week%2008)
 ### [:nine: Forward declaration, Inheritance](https://github.com/xKrashx/Object_Oriented_Programming/tree/main/Seminar/Week%2009)
+### [:one::zero: Virtual functions, Virtual tables, Abstract classes, Polymorphism, Diamond problem](https://github.com/xKrashx/Object_Oriented_Programming/tree/main/Seminar/Week%2010)
 
 ## :pushpin: Contents by weeks (Practicum):
 ### [:one: Enums, Namespaces](https://github.com/xKrashx/Object_Oriented_Programming/tree/main/Practicum/Week%2001)