created generic singleton script and inherited enemy and player tank class from the generic class.

1. Created Generic singleton for enemy and player tank class.
2. fixed min attribute ambiguous issue.

Added the ability to destroy the gameobject instead of she script.

Added MVC functionality

Added movement to Tank Controller

1. Included different Tank types and Bullet types using scriptable objects.
2. Spawn enemies at different location with random patrolling.
3. Ability to shoot bullets and destroy enemy tanks.

When the player is destroyed, the other enemy tanks are destroyed and finally the whole world is destroyed slowly using coroutines.

'X' is assigned as key to destruct player for testing purpose.

Added a StateMachine to the TankController to manage different states of the enemy tank

Imlemented 3 types of Acheivements based on 1. Bullet fired, 2. Distance travelled, 3. Kills. using Observer pattern.

Each type have 3 different acheivement states to unlock based on parameters.