Add LICENSE file

[valenting]

A license needs to be chosen for this repo.
All contributors need to agree with the chosen license.
A list of contributors is enclosed below:

• Mihai Maruseac @mihaimaruseac
• Lucian Adrian Grijincu @luciang
• Razvan Deaconescu @razvand
• Andrei Soare @andreisoare
• Victor Cărbune @vcarbune
• Vlad Dogaru @ddvlad
• Mihai Bivol @mihaibivol
• Alex Eftimie @alexef
• @andradaq
• Laura Mihaela Vasilescu @lauravasilescu
• Barbulescu Mihai @b12mihai
• Flavius Anton @flaviusanton
• Vlad Voicu @vladvoic
• @alexandrujuncu
• Sergiu Iordache @liquidsnake

(This message was generated automatically.)

[lauuuuuura]

I think someone (who is in charge of this repository) should pick a license and everyone else should reply in order to agree with that license. Maybe @mihaimaruseac ?

[mihaimaruseac]

I am OK with any license