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Bcd Counter
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Create a 4x4-bit Bcd counter which able to count 0000,0001,0002...0009,0010,0011, ..,9998, 9999 and start all over again.
Inspiration can be found in Wakerly chapter 8 (read about the 74xx163 counter).

You could chose between a single Bcd counter which could be combined (actually 4 counters) in a schematic, alternatively could you create a "pure" VHDL solution. 

NB! Next task will be watch counter like 00:00:00 to 23:59:59