Add TOC to README.adoc
= `mvnd` - the Maven Daemon
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image::https://img.shields.io/twitter/url/https/twitter.com/mvndaemon.svg?style=social&label=Follow%20%40mvndaemon[link="https://twitter.com/mvndaemon"]
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+== Introduction
+
This project aims at providing faster https://maven.apache.org/[Maven] builds using techniques known from Gradle and
Takari.
