Create 18_LongestIncreasingSubsequence.cs

18.* Write a program that reads an array of integers and removes from it a minimal number of elements in such way that the remaining array is sorted in increasing order. Print the remaining sorted array.
   Example:	{6, 1, 4, 3, 0, 3, 6, 4, 5} -> {1, 3, 3, 4, 5}