Add user model through devise. Add some basic layout. Start testing in travis.

app/models/user.rb

@@ -0,0 +1,7 @@
+class User < ApplicationRecord
+  # Include default devise modules. Others available are:
+  # :confirmable, :lockable, :timeoutable, :trackable and :omniauthable
+  devise :database_authenticatable, :registerable,
+         :recoverable, :rememberable, :validatable, :confirmable,
+         :lockable, :timeoutable, :trackable, :omniauthable
+end