Update visual-studio-2015.jade

[prashantma]

In Step 7 (Build and Run App), there needs to be instruction to set index.html as start page, so that when Run button or F5 is pressed to run the application, browser shows index.html

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[googlebot]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

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Once you've signed, please reply here (e.g. I signed it!) and we'll verify. Thanks.

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• If you've already signed a CLA, it's possible we don't have your GitHub username or you're using a different email address. Check your existing CLA data and verify that your email is set on your git commits.
• If you signed the CLA as a corporation, please let us know the company's name.

[prashantma]

I signed it!

[googlebot]

CLAs look good, thanks!

[googlebot]

CLAs look good, thanks!

[Foxandxss]

ping @DeborahK

[wardbell]

This is fine. Thanks.