README: elaborate, use markdown

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-Installation
-============
-
-chown root:mail /usr/libexec/dma
-chmod 2555 /usr/libexec/dma
-mkdir /var/spool/dma
-chown root:mail /var/spool/dma
-chmod 2775 /var/spool/dma
-chown root:mail /var/mail
-chmod 2775 /var/mail
-chgrp mail /var/mail/*
-chmod 620 /var/mail/*

diff --git a/README.markdown b/README.markdown
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+dma -- DragonFly Mail Agent
+===========================
+
+dma is a small Mail Transport Agent (MTA), designed for home and
+office use.  It accepts mails from locally installed Mail User Agents (MUA)
+and delivers the mails either locally or to a remote destination.
+Remote delivery includes several features like TLS/SSL support and
+SMTP authentication.
+
+dma is not intended as a replacement for real, big MTAs like sendmail(8)
+or postfix(1).  Consequently, dma does not listen on port 25 for
+incoming connections.
+
+
+Building
+--------
+
+       make
+
+
+Installation
+------------
+
+       make install sendmail-link mailq-link install-spool-dirs
+
+
+Contact
+-------
+
+Simon Schubert <2@0x2c.org>