added Question #2 (#2)

Author: ygit

README.md

@@ -5,6 +5,15 @@ Solve Coding Interview Problems using Swift
 Ready for First Question?
 Solve it & raise a Pull Request.
 
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+#2 This problem was asked by Microsoft.
+
+Describe and give an example of each of the following types of polymorphism:
+
+- Ad-hoc polymorphism
+- Parametric polymorphism
+- Subtype polymorphism
 
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