adds booth backend for index, show, create and edit actions

spec/models/poll/booth_spec.rb

@@ -0,0 +1,16 @@
+require 'rails_helper'
+
+describe :booth do
+
+  let(:booth) { build(:poll_booth) }
+
+  it "should be valid" do
+    expect(booth).to be_valid
+  end
+
+  it "should not be valid without a name" do
+    booth.name = nil
+    expect(booth).to_not be_valid
+  end
+
+end