better readme

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-Sbt plugin to generate results in tap format. 

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+Provides reporting of test success and failure for tests run by
+[simple build tool](https://github.com/harrah/xsbt)
+in a [TAP](http://en.wikipedia.org/wiki/Test_Anything_Protocol)format
+
+All the test results will be generated in one file: test-results/test.tap
+
+To use
+
+1. Add this plugin to your sbt project. Create project/project/Plugins.scala that looks like this:
+
+        import sbt._
+        // sets up other project dependencies when building our root project
+        object Plugins extends Build {
+          lazy val root = Project("root", file(".")) dependsOn(tapListener)
+          lazy val tapListener = RootProject(uri("git://github.com/mkhettry/sbt-tap.git"))
+        }
+
+2. In your build.sbt, add the SbtTapListener to the sequence of Test Listeners.
+
+        testListeners += SbtTapReporting.tapListener
+