Game functionality. Required: C

Add basic data structures (others might be needed):
* Player
* Team
* Game
* Round
* Hand
* Card
Create functions to add/extract informations or to create new instances of the data structures, for example:
* Add player
* Add team
* Join a team
* Leave a team
* Get score
Create helper functions, like shuffle deck.
Create functions for user interactions, like show cards or pick a card.
Add basic text commands for interaction. It should be possible to play the game using them.

Networking: C, sockets, encrypt/decrypt functions and methods