add small plugins file

Author: bahmutov

plugins.js

@@ -0,0 +1,13 @@
+// common Cypress plugin file you can point at to have the
+// code coverage tasks registered correctly. From your "cypress.json" file
+// {
+//   "pluginsFile": "@cypress/code-coverage/plugins",
+//   "supportFile": "@cypress/code-coverage/support"
+// }
+//
+module.exports = (on, config) => {
+  require('./task')(on, config)
+  // IMPORTANT to return the config object
+  // with the any changed environment variables
+  return config
+}