cmat file made for testing

Branch provies a .cmat file that can be used for testing.

Expected output was not made by hand because it would be long, tedious and most likely contain more mistakes than if a lexer made it.

Goal is to provide a cmat file that can be used to help the development of the lexer lexer.l. Expected output should be created when lexer is ready. The .cmat file and expected output will then help future development by alerting us if the lexer were to change and not recognize tokens anymore.

Branch also states that the make rules: 'make tests' and 'make test_lexer' exist, which is not yet true, comments will be added to the related issue to inform the person responsible of creating them.