Add new user story representing the new RootPlugin feature. Update ordering/AddSettingsusage.

User-Stories:-Project-Natures---AutoPlugins.md

@@ -92,13 +92,8 @@ User adds the following to their `build.sbt`:
 ```scala
 import AddSettings._
 
-val autoPluginsExceptXYZ =
-  plugins {
-    case x: AutoPlugin => x != XYZ
-    case _ => fasle
-  }
-
-val enableXYZ = plugins(_ == XYZ)
+val autoPluginsExceptXYZ = autoPlugins(_ != XYZ)
+val enableXYZ = autoPlugins(_ == XYZ)
 
 val important = project.autoSettings(autoPluginsExceptXYZ, enableXYZ, projectSettings, defaultSbtFiles, userSettings)
 ```
@@ -109,4 +104,22 @@ This would ensure the following setting order:
 2. The XYZ plugin specficially
 3. The settings configured via Build.scala files directly on project instances
 4. Any .sbt files found in the baseDirectory of the build.
-5. Any settings found in .sbt files of the User's sbt home (`~/.sbt/0.13`)
+5. Any settings found in .sbt files of the User's sbt home (`~/.sbt/0.13`)
+
+## User Story:  user wants to create a C++ workflow that does not include the Java workflow
+
+1. User creates a 'root' plugin representing the core C++ features:
+
+```scala
+object CppPlugin extends RootPlugin {
+   override def projectSettings = ...
+   override def globalSettings = ...
+}
+```
+
+2. Create a helper project instantiation.
+
+```scala
+def cppProject(name: String, dir: File): Project =
+    Project(name,file).disablePlugin(plugins.JvmModule).addPlugins(CppPlugin)
+```