Add action to run Cypress tests

Example action
```yml
name: End-to-end tests
on: [push]
jobs:
  cypress-run:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v1
      # Install NPM dependencies, cache them correctly
      # and run all Cypress tests
      - name: Cypress run
        uses: cypress-io/github-action@v1
```

README.md

@@ -256,6 +256,7 @@ https://github.com/sdras/awesome-actions/workflows/Lint%20Awesome%20List/badge.s
 - [Catch insensitive, inconsiderate writing in your markdown docs](https://github.com/theashraf/alex-action)
 - [Run TestCafe tests](https://github.com/DevExpress/testcafe-action)
 - [Run Unity tests](https://github.com/webbertakken/unity-test-runner)
+- [Run Cypress E2E tests](https://github.com/cypress-io/github-action)
 
 ### Security