implemented basic e2e testing

e2e/.gitignore

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+screenshots/
+videos/
+node_modules/

e2e/CYPRESS.md

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+# Testing with cypress
+
+This project use [cypress](https://www.cypress.io/) to do functional testing of the website.
+Unfortunately we cannot integrate it with docker-compose for the moment, so you will need to install some packages locally on your pc. 
+
+You will need to install theses dependancies on linux (don't know about mac):
+
+```bash
+sudo apt update
+sudo apt install libgtk2.0-0 libgtk-3-0 libnotify-dev libgconf-2-4 libnss3 libxss1 libasound2 libxtst6 xauth xvfb
+```
+
+Cypress can be installed locally in the e2e directory
+```bash
+cd e2e
+npm install
+```
+
+
+How to use:
+```bash
+npm run cy:run
+npm run cy:open
+```
+
+The first command will run all tests in the terminal, while the second will open the interactive task runner which allow you to easily manage the test workflow 
+
+[More details here](https://docs.cypress.io/guides/getting-started/testing-your-app.html#Step-1-Start-your-server)

e2e/cypress.json

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+{
+	"baseUrl": "http://workadventure.localhost",
+	"video": false,
+	"pluginsFile": false,
+	"supportFile": false
+}

e2e/cypress/integration/spec.js

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+Cypress.on('window:before:load', (win) => {
+	// because this is called before any scripts
+	// have loaded - the ga function is undefined
+	// so we need to create it.
+	win.cypressAsserter = cy.stub().as('ca')
+})
+
+describe('WorkAdventureGame', () => {
+	beforeEach(() => {
+		cy.visit('/', {
+			onBeforeLoad (win) {
+				cy.spy(win.console, 'log').as('console.log')
+			},
+		})
+		
+	});
+
+	it('loads', () => {
+		cy.get('@console.log').should('be.calledWith', 'Started the game')
+		cy.get('@console.log').should('be.calledWith', 'Preloading')
+		cy.get('@console.log').should('be.calledWith', 'Preloading done')
+		cy.get('@console.log').should('be.calledWith', 'startInit')
+		cy.get('@console.log').should('be.calledWith', 'startInit done')
+	});
+});

e2e/package.json

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+{
+  "dependencies": {
+    "cypress": "^3.8.3"
+  },
+  "scripts": {
+    "cy:run": "cypress run",
+    "cy:open": "cypress open"
+  }
+}