Improve package description and add tags

T4.Build/T4.Build.nuspec

@@ -4,11 +4,22 @@
  <id>T4.Build</id>
  <version>$version$</version>
  <authors>Jonathan Giannuzzi</authors>
- <description>Tool to automatically transform T4 templates during build</description>
+ <description>
+ T4.Build is a tool to automatically transform T4 templates during build.
+
+ It is similar to the functionality provided by Visual Studio, except it works anywhere where you have a .NET (Core) runtime installed.
+
+ It is fully integrated with MSBuild and supports transforming the templates during the build process, and cleaning them during the clean process.
+
+ T4.Build aims for performance by transforming only the templates that have changed, and doing so in parallel (so more CPU cores => faster).
+
+ More information: https://github.com/jgiannuzzi/T4.Build#readme
+ </description>
  <repository type="git" url="https://github.com/jgiannuzzi/T4.Build" />
  <projectUrl>https://github.com/jgiannuzzi/T4.Build</projectUrl>
  <license type="expression">Apache-2.0</license>
  <licenseUrl>https://licenses.nuget.org/Apache-2.0</licenseUrl>
+ <tags>MSBuild build T4 text template templating transform</tags>
  </metadata>
  <files>
  <file src="bin/$configuration$/$framework$/*.dll" exclude="**/Microsoft.CodeAnalysis*.dll;**/System.Reflection.Metadata.dll;**/System.Collections.Immutable.dll" target="tools/" />