chore: move frontend files

frontend/cypress/README.md

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+# Frontend Testing With Cypress
+
+## Setup
+
+* Enable the [seeder api endpoint](https://vikunja.io/docs/config-options/#testingtoken). You'll then need to add the testingtoken in `cypress.json` or set the `CYPRESS_TEST_SECRET` environment variable.
+* Basic configuration happens in the `cypress.json` file
+* Overridable with [env](https://docs.cypress.io/guides/guides/environment-variables.html#Option-3-CYPRESS)
+* Override base url with `CYPRESS_BASE_URL`
+
+## Fixtures
+
+We're using the [test endpoint](https://vikunja.io/docs/config-options/#testingtoken) of the vikunja api to
+seed the database with test data before running the tests.
+This ensures better reproducability of tests.
+
+## Running The Tests Locally
+
+### Using Docker
+
+The easiest way to run all frontend tests locally is by using the `docker-compose` file in this repository.
+It uses the same configuration as the CI.
+
+To use it, run
+
+```shell
+docker-compose up -d
+```
+
+Then, once all containers are started, run
+
+```shell
+docker-compose run cypress bash
+```
+
+to get a shell inside the cypress container.
+In that shell you can then execute the tests with
+
+```shell
+pnpm run test:e2e
+```
+
+### Using The Cypress Dashboard
+
+To open the Cypress Dashboard and run tests from there, run
+
+```shell
+pnpm run test:e2e:dev
+```