Create 1929-concatenation-of-array.cs

[proninp]

https://leetcode.com/problems/concatenation-of-array/description/

• File(s) Modified: 1929-concatenation-of-array.cs
• Language(s) Used: csharp
• Submission URL: https://leetcode.com/problems/concatenation-of-array/solutions/3537346/simple-c-solution/

Important

Please make sure the file name is lowercase and a duplicate file does not already exist before merging.