Add baselines to enable checks for breaking changes

[dougbu]

[dougbu]

The one shipped project in this repo lacks baselines. Looks like baseline files (baseline.net45.json and baseline.netcore.json) should be created in release or rel/1.0.1 and checked into at least dev. The details below are reformatted from a recent Universe build on the CI.

[BrowserLink\src\Microsoft.VisualStudio.Web.BrowserLink\Microsoft.VisualStudio.Web.BrowserLink.csproj]
  No baseline file for net46 found in Microsoft.VisualStudio.Web.BrowserLink.
  No baseline file for netstandard1.5 found in Microsoft.VisualStudio.Web.BrowserLink.