add README.md on what this repository is all about

README.md

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+osmo-dfds - RF delay simulator
+==============================
+
+This repository contains the source code for an RF delay simulator,
+which can be used to artificially delay RF signals by a configurable
+amount of [variable] delay.  This is useful to test timing control
+loops in TDMA systems, such as GSM.
+
+It is part of the [Osmocom](https://osmocom.org/) Open Source Mobile
+Communications project.
+
+Homepage
+--------
+
+The official homepage of the project is
+https://osmocom.org/projects/osmo-rfds/wiki/Wiki
+
+GIT Repository
+--------------
+
+You can clone from the official osmo-rfds.git repository using
+
+	git clone git://git.osmocom.org/osmo-rfds.git
+	git clone https://git.osmocom.org/osmo-rfds.git
+
+There is a cgit interface at https://git.osmocom.org/osmo-rfds/
+
+Documentation
+-------------
+
+See the doc/ sub-directory.
+
+Mailing List
+------------
+
+Discussions related to osmo-rfds are happening on the
+openbsc@lists.osmocom.org mailing list, please see
+https://lists.osmocom.org/mailman/listinfo/openbsc for subscription
+options and the list archive.
+
+Please observe the [Osmocom Mailing List
+Rules](https://osmocom.org/projects/cellular-infrastructure/wiki/Mailing_List_Rules)
+when posting.