Add Measurements tab and #new form

app/controllers/measurements_controller.rb

@@ -0,0 +1,14 @@
+class MeasurementsController < ApplicationController
+  def index
+    @quantities = current_user.quantities.ordered
+  end
+
+  def new
+  end
+
+  def create
+  end
+
+  def destroy
+  end
+end