Add ability to start lecture and redirect to recorded content.

test/controllers/lecture_controller_test.rb

@@ -0,0 +1,8 @@
+require "test_helper"
+
+class LectureControllerTest < ActionDispatch::IntegrationTest
+  test "should get start" do
+    get lecture_start_url
+    assert_response :success
+  end
+end