Create 07_MostEqualNeightbors.cs

07. Write a program that finds the largest area of equal neighbor elements in a rectangular matrix and prints its size.
 Example:
 1 3 2 2 2 4
 3 3 3 2 4 4
 4 3 1 2 3 3  ->  13
 4 3 1 3 3 1
 4 3 3 3 1 1
  
 Hint: you can use the algorithm "Depth-first search" or "Breadth-first search" (find them in Wikipedia).