Added trade unions

Server/db/migrations/19_create_table_cooperatives_users.jl

@@ -0,0 +1,24 @@
+module CreateTableCooperativesUsers
+
+import SearchLight.Migrations: create_table, column, primary_key, add_index, drop_table
+
+function up()
+    create_table(:cooperatives_users) do
+        [
+            primary_key()
+            column(:user_id, :int)
+            column(:cooperative_id, :int)
+        ]
+    end
+
+    add_foreign_key(:cooperatives_users,:user_id,:users,:id)
+    add_foreign_key(:cooperatives_users,:cooperative_id,:cooperatives,:id)
+    add_index(:cooperatives_users, :user_id)
+    add_index(:cooperatives_users, :cooperative_id)
+end
+
+function down()
+    drop_table(:cooperatives_users)
+end
+
+end