Added assets

new file:   buildings_alien_HQ.unitypackage
new file:   buildings_alien_turret.unitypackage
new file:   buildings_barrack_v0.2.unitypackage
new file:   buildings_gatling_basic_v1.0.unitypackage
new file:   buildings_gatling_complete_v1.0.unitypackage
new file:   character_alien_v1.1.unitypackage
new file:   character_ciccio_v1.1.unitypackage
new file:   character_mamalien_v1.1.unitypackage
new file:   character_smilzo_v1.1.unitypackage