How to ng serve this repo

[8155220]

I have tried :
git clone https://github.com/angular/material2.git
npm install
ng serve

I have got this error :
Local workspace file ('angular.json') could not be found.
Error: Local workspace file ('angular.json') could not be found.
at WorkspaceLoader._getProjectWorkspaceFilePath (C:\Users\Shep\AppData\Roaming\npm\node_modules@angular\cli\models\workspace-loader.js:37:19)
at WorkspaceLoader.loadWorkspace (C:\Users\Shep\AppData\Roaming\npm\node_modules@angular\cli\models\workspace-loader.js:24:21)
at ServeCommand._loadWorkspaceAndArchitect (C:\Users\Shep\AppData\Roaming\npm\node_modules@angular\cli\models\architect-command.js:180:32)
at ServeCommand. (C:\Users\Shep\AppData\Roaming\npm\node_modules@angular\cli\models\architect-command.js:47:25)
at Generator.next ()
at C:\Users\Shep\AppData\Roaming\npm\node_modules@angular\cli\models\architect-command.js:7:71
at new Promise ()
at __awaiter (C:\Users\Shep\AppData\Roaming\npm\node_modules@angular\cli\models\architect-command.js:3:12)
at ServeCommand.initialize (C:\Users\Shep\AppData\Roaming\npm\node_modules@angular\cli\models\architect-command.js:46:16)
at Object. (C:\Users\Shep\AppData\Roaming\npm\node_modules@angular\cli\models\command-runner.js:87:23)

ng -v :

Angular CLI: 6.0.8
Node: 8.11.3
OS: win32 x64
Angular: 7.0.0-rc.0
... animations, cdk, common, compiler, compiler-cli, core, forms
... http, material, platform-browser, platform-browser-dynamic
... platform-server, router

Package Version

@angular-devkit/architect 0.6.8 (cli-only)
@angular-devkit/core 0.6.8 (cli-only)
@angular-devkit/schematics 0.6.8 (cli-only)
@schematics/angular 0.6.8 (cli-only)
@schematics/update 0.6.8 (cli-only)
rxjs 6.3.3
typescript 3.1.1

[crisbeto]

We're not using the CLI. You can run npm run demo-app to run our dev app.

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