How to run:

./diff [file to read 1] [file to read 2] [output file]

*** [output file] is optional. If output isn't declared, default output file will be diff.yaml

Example 1:

./diff test1.yaml test2.yaml save.yaml => output file will be save.yaml

Example 2:

./diff test1.yaml test2.yaml => output file will be diff.yaml