Changes

tsk25 - Adds Competition entity: Adds the entity Competition in order
with the specificationes in Kunagi task25. This entity has 2 enumerated
attributes (sport and type) This commit adds the enumeration class
CompetitionType for attribute type. SportType class was alredy
implemented. this commit adds too a Headquarter entity with info
atributes for a headquarter. Adds too tests for both entities.