Added README.md.

README.md

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+# Command Line Execution plug-in for [Kobalt](http://beust.com/kobalt/home/index.html)
+
+[![License (3-Clause BSD)](https://img.shields.io/badge/license-BSD%203--Clause-blue.svg?style=flat-square)](http://opensource.org/licenses/BSD-3-Clause) [![Build Status](https://travis-ci.org/ethauvin/kobalt-exec.svg?branch=master)](https://travis-ci.org/ethauvin/kobalt-exec)
+
+```kotlin
+var pl = plugins("net.thauvin.erik:kobalt-exc:")
+
+var p = project {
+    exec {
+       commandLine(listOf("echo", "Hello, World!"))
+    }
+}
+```
+
+```sh
+./kobaltw assemble exec
+```