Add first commands in CL

[GuillemBarroso]

Now the CL is just repeating the input text.

Create an object Command that collets all the command information such as:

• name
• short name
• options
• description
• examples

Then. start adding the first commands:

• help (list all commands)
• cl (interact with CL. Maximize, for instance, so we can scroll up and down)
• FPS
• ...