Example cannot handle space character in path

> Please provide us with the following information:
> ---------------------------------------------------------------

### This issue is for a: (mark with an `x`)
```
- [X] bug report -> please search issues before submitting
- [ ] feature request
- [ ] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)
```

### Minimal steps to reproduce
> Download repository as ZIP file into a folder on your local PC which has space character(s) in its path name. Open .sln in Visual Studio, modify Program.cs as explained in tutorial, and run.

### Any log messages given by the failure
> stderr.txt contains failure message about specified path cannot be found.

### Expected/desired behavior
> path is escaped when creating the Azure task Command Line so it works with spaces.

### OS and Version?
> Windows 10 and Visual Studio 2017, but expected to occur in any version

### Versions
>

### Mention any other details that might be useful

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> Thanks! We'll be in touch soon.

Visual Studio で .sln を開き、チュートリアルの手順に従って Azure task コマンド ラインを作成する Program.cs を確認します。スペースを含むパスにリポジトリを配置して失敗を再現し、stderr.txt を確認します。サンプルが正常に実行され、生成されたコマンドがパス内のスペースを処理できれば完了です。

索引モデルが issue の本文から書いたものです。