The whole point of this homework assignment is for you to learn how to convert a problem statement "mod 5 counter using JK" into an actual implementation.
1. figure out what the truth table that must be implemented. (hint mod 5 means it repeatedly cycles over 5 values)
2. create a K-Map for each output bit of the truth table sequence.
3. translate the equations to JK.
4. write the VHDL description that represents the logic found in 3.