Add problem statement

Author: Udit Agarwal

problem-statement.md

@@ -1,11 +1,11 @@
 ## Problem Statement
-We have to do low level design for a Cache system. Cache that we will design will have to support 2 operations:
+We have to do low level design for a Cache system. Cache that we will design will have to support following operations:
 * **Put**: This will allow user to put a value against a key in the cache.
 * **Get**: This will allow user to get the previously saved value using key.
-* **Eviction**: Cache should also support removal of some key in case cache is full and we try to add new key value.
+* **Eviction**: Cache should also support removal of some key in case cache is full, and we try to add new key value.
 
 ### Expectations
 * Code should be functionally correct.
 * Code should be modular and readable. Clean and professional level code.
-* Code should be extesible and scalable. Means it should be able to accomodate new requirements with minimal changes.
+* Code should be extensible and scalable. Means it should be able to accommodate new requirements with minimal changes.
 * Code should have good OOPs design.