Implement a multi threading application for matrix addition using pthread library. Each matrix should have N columns (up to 1000) and M rows (up to 1000). Elements are integers. Attach the resulting code as well as sample input and output here.

Some specifications:

Input: at least 2 files containing 1 matrix each (max 10 files).

Example of the file contents:

File1:

1 2 3 4

5 6 7 8

9 10 11 12

13 14 15 16

File2:

10 10 10 10

10 10 10 10

10 10 10 10

10 10 10 10