Handle Mob class

[eklipse18]

Implement the mob class for basic mobs such as cows, goats, sheep etc that inherit this mob class. Inherits entity class props:

• health - health of the mob
• drop - What it drops

[Ibrahim2750mi]

add methods for its Path finding AI for each mob

[Ibrahim2750mi]

These also need to be added:

• [ ] random spawning
• [ ] walking animation for the mobs
• [ ] path finding