Add a controler for "User" (add and authenticate)

Back/skydiveLogs-api.Data/LiteDbProvider.cs

@@ -37,5 +37,7 @@ namespace skydiveLogs_api.Data
         public ILiteCollection<JumpType> CollOfJumpType => _db.GetCollection<JumpType>();
 
         public ILiteCollection<Jump> CollOfJump => _db.GetCollection<Jump>();
+
+        public ILiteCollection<User> CollOfUser => _db.GetCollection<User>();
     }
 }