Add a sample cover

[ekspek]

A working sample cover should be added for the sample test document(s).

While this cover shouldn't need to be dynamic (i.e. work with the \makecover command), it is recommend further down the line, using the macros already introduced in the class file (possibly more if necessary). The major issue with this implementation remains having the \author command work properly for any number of authors, and to have it work optionally with a student number.

[ekspek]

Cover working, multiple authors implemented using the article class native command \author{} which uses \and to separate authors. Example included in mwe.tex.