Added ColumnView model

cmd:
rails generate redmine_plugin_model body_tracking column_view
project:references name:string domain:integer
rails generate migration CreateQuantitiesColumnViews quantity:references
column_view:references

test/unit/column_view_test.rb

@@ -0,0 +1,9 @@
+require File.expand_path('../../test_helper', __FILE__)
+
+class ColumnViewTest < ActiveSupport::TestCase
+
+  # Replace this with your real tests.
+  def test_truth
+    assert true
+  end
+end