ADD watchers_count filed to projects table

db/migrate/20200106022235_add_watchers_count_to_projects.rb

@@ -0,0 +1,5 @@
+class AddWatchersCountToProjects < ActiveRecord::Migration[5.2]
+  def change
+    add_column :projects, :watchers_count, :integer, :default => 0
+  end
+end