add: user pinned projects

app/models/pinned_project.rb

@@ -0,0 +1,22 @@
+# == Schema Information
+#
+# Table name: pinned_projects
+#
+#  id         :integer          not null, primary key
+#  user_id    :integer
+#  project_id :integer
+#  position   :integer          default("0")
+#  created_at :datetime         not null
+#  updated_at :datetime         not null
+#
+# Indexes
+#
+#  index_pinned_projects_on_project_id  (project_id)
+#  index_pinned_projects_on_user_id     (user_id)
+#
+
+class PinnedProject < ApplicationRecord
+
+  belongs_to :user 
+  belongs_to :project 
+end