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 Bivol @mihaibivol
• [ ] Alex Eftimie @alexef
• [ ] Mihai Tiriplica @tiriplicamihai
• [ ] Maria Niță @maria
• [ ] Andrei Oprea @piatra
• [ ] @amelledot
• [ ] Marius Coțofană @mariuscoto
• [ ] @iulianstana
• [ ] @ancadiana23
• [ ] Andrei Duma @AndreiDuma
• [ ] @marialivia16
• [ ] Andra Simionov @AndraSimionov
• [ ] Alex Palcuie @palcu
• [ ] @andra-maria
• [ ] Alexandru Topliceanu @topliceanu
• [ ] Taygun Agiali @taygun
• [ ] Elisabeta @17thFox
• [ ] Boboc Diana-Andreea @bobocdiana
• [ ] George Pîrlea @dranov
• [ ] Iulian Răzvan Mateșică @mateiuli
• [ ] Valentin Gosu @valenting
• [ ] @VictorGruescu
• [ ] Neagu Rares @xiofurry

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