Add some code help to cypress folder

client/cypress/.eslintrc.js

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+module.exports = {
+  "extends": [
+    "plugin:cypress/recommended"
+  ]
+}

client/cypress/support/index.d.ts

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+// Intellisense for custom Commands: https://github.com/cypress-io/cypress-example-todomvc#cypress-intellisense
+declare namespace Cypress {
+  interface Chainable<Subject> {
+    /**
+     * Login via API call to the GraphQL endpoint, without calling the frontend. Faster than the other login.
+     * @param   username
+     * @param   password
+     * @example
+     * cy.apolloLogin('nico.zickgraf', 'test')
+     */
+    apolloLogin(username: string, password: string): Chainable<any>
+
+    /**
+     * Selects an element based on the `data-cy=xxx` attribute
+     * @param selector - The value of the data-cy attribute to select
+     * @example
+     * cy.dataCy('my-new-button')
+     */
+    dataCy(selector: string): Chainable<any>
+
+    selectClass(schoolClass: string): void
+
+    login(username:string, password:string, visitLogin?: boolean): void
+    fakeLogin(username:string, password:string): void
+  }
+}

client/cypress/tsconfig.json

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+{
+  "compilerOptions": {
+    "allowJs": true,
+    "checkJs": true,
+    "resolveJsonModule": true,
+    "types": [
+      "cypress"
+    ]
+  },
+  "include": [
+    "**/*.*"
+  ]
+}