chore(i18n,docs): initialise japanese docs (#43527)

docs/i18n/japanese/how-to-add-cypress-tests.md

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+# How to add Cypress tests
+
+When making changes to JavaScript, CSS, or HTML which could change the functionality or layout of a page, it's important to add corresponding [Cypress](https://docs.cypress.io) integration tests.
+
+To learn how to write Cypress tests, or 'specs', please see Cypress' official [documentation](https://docs.cypress.io/guides/getting-started/writing-your-first-test.html).
+
+## Where to add a test
+
+- Cypress tests are in the `./cypress` directory.
+
+- Cypress tests for a curriculum module are in the corresponding curriculum directory, i.e. `cypress/integration/learn/responsive-web-design/basic-css/index.js`.
+
+## How to run tests
+
+> [!NOTE] If using GitPod, please see [Cypress-GitPod Setup](/how-to-add-cypress-tests#cypress-gitpod-setup)
+
+### 1. Ensure that MongoDB and client applications are running
+
+- [Start MongoDB and seed the database](/how-to-setup-freecodecamp-locally#step-3-start-mongodb-and-seed-the-database)
+
+- [Start the freeCodeCamp client application and API server](/how-to-setup-freecodecamp-locally#step-4-start-the-freecodecamp-client-application-and-api-server)
+
+### 2. Run the cypress tests
+
+To run tests against production builds, replace `dev` with `prd` below.
+
+- To run all tests in the `./cypress` directory:
+
+  ```console
+  npm run cypress:dev:run
+  ```
+
+- To run a single test:
+
+  ```console
+  npm run cypress:dev:run -- --spec=cypress/pathToYourSpec/youSpecFileName.js
+  ```
+
+- To create a development build, start the development server, and run all existing cypress end-to-end tests:
+
+  ```console
+  npm run e2e:dev:run
+  ```
+
+## Cypress-GitPod Setup
+
+### 1. Ensure you are on the _Feature Preview_ of GitPod _as of 01/02/2021_
+
+- Go to [GitPod Docs - Feature Preview](https://www.gitpod.io/docs/feature-preview/) to see how to enable _Feature Preview_
+
+### 2. Ensure Development Environment is Running
+
+If starting the GitPod environment did not automatically develop the environment:
+
+- Start the database
+
+```console
+mongod
+```
+
+- Seed the database
+
+```console
+npm run seed
+```
+
+- Develop the server and client
+
+```console
+npm run develop
+```
+
+### 3. Install Cypress Build Tools
+
+```console
+npm run cypress:install-build-tools
+```
+
+- When prompted in the terminal, select your keyboard layout by language/area
+
+Now, [Cypress can be run](/how-to-add-cypress-tests#_2-run-the-cypress-tests)