feature/RPG-9-add-abilities

[thsergitox]

As a player
I need to use player abilities So that I'll have more options to deal damage in battle

Details and Assumptions

• At least 2 usable abilities
• Need a mana system to use the abilities if a have enough mana
• Need a way to use the abilities (endpoints)
• Need a way to see my actual abilities

Acceptance Criteria

Given a player with 100 mana
When the player use 1 ability
Then the player mana should be less than 100

Given a player with 0 mana
When the player use 1 ability
Then should be an error of not enough mana