Start some basic documentation on automating app packaging via TeamCity (source Issue #737)

docs/using/teamcity.md

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+| [docs](..)  / [using](.) / teamcity.md
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+
+
+# Team City Packaging
+
+
+## Adding the Packaging Step
+
+When TeamCity pulls down your code, the squirrel.exe will sit under packages if it was added to your solution using NuGet.
+
+1. Add a NuGet Pack process which will create the .nupkg based on a .nuspec file to ensure the package is correct.
+2. Create a command line build process and add the following:
+
+~~~
+%system.teamcity.build.workingDir%\packages\squirrel.windows.1.4.0\tools\squirrel --releasify [BUILD_SERVER_NUPKG_PATH]\%system.build.number%.nupkg -r [OUTPUT_PATH]
+~~~
+
+**Note:** Paths may vary depending on your structure so make sure to update the path information above correctly.
+
+This will cause the appropriate files to be created just as if you had run it from the Package Manager Console.
+