Update README file with general project info and use Markdown

Also, it seems the readme was so far not included in any tarballs (make
dist).  Let's change that.

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+osmo-pcu - Osmocom Packet Control Unit
+======================================
+
+This repository contains a C/C++-language implementation of a GPRS
+Packet Control Unit, as specified by ETSI/3GPP.  It is part of the
+[Osmocom](https://osmocom.org/) Open Source Mobile Communications
+project.
+
+The Packet Control Unit is terminating the Layer 2 (RLC/MAC) of the GPRS
+radio interface and adapting it to the Gb Interface (BSSGP+NS Protocol)
+towards the SGSN.
+
+The PCU interfaces with the physical layer of the radio interface.
+OsmoPCU is typically used co-located with the BTS, specifically
+[OsmoBTS](https://osmocom.org/projects/osmobts/wiki).
+For legacy BTSs that run proprietary sotware without an interface to
+OsmoPCU, you may also co-locate it with the BSC, specifically
+[OsmoBSC](https://osmocom.org/projects/openbsc/wiki/Osmo-bsc)
+
+Homepage
+--------
+
+The official homepage of the project is
+https://osmocom.org/projects/osmopcu/wiki/OsmoPCU
+
+GIT Repository
+--------------
+
+You can clone from the official osmo-pcu.git repository using
+
+	git clone git://git.osmocom.org/osmo-pcu.git
+
+There is a cgit interface at http://git.osmocom.org/osmo-pcu/
+
+Documentation
+-------------
+
+We provide a
+[user manual](http://ftp.osmocom.org/docs/latest/osmopcu-usermanual.pdf)
+as well as a
+[vty reference manual](http://ftp.osmocom.org/docs/latest/osmopcu-vty-reference.pdf)
+
+Please note that a lot of the PCU configuration actually happens inside
+the BSC, which passes this configuration via A-bis OML to the BTS, which
+then in turn passes it via the PCU socket into OsmoPCU.
+
+Mailing List
+------------
+
+Discussions related to osmo-pcu are happening on the
+osmocom-net-gprs@lists.osmocom.org mailing list, please see
+https://lists.osmocom.org/mailman/listinfo/osmocom-net-gprs 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.
+
+Contributing
+------------
+
+Our coding standards are described at
+https://osmocom.org/projects/cellular-infrastructure/wiki/Coding_standards
+
+We us a gerrit based patch submission/review process for managing
+contributions.  Please see
+https://osmocom.org/projects/cellular-infrastructure/wiki/Gerrit for
+more details
+
+The current patch queue for osmo-pcu can be seen at
+https://gerrit.osmocom.org/#/q/project:osmo-pcu+status:open
+
+
+Current limitations
+-------------------
+
+ * No PFC support
+ * No fixed allocation support
+ * No extended dynamic allocation support
+ * No unacknowledged mode operation
+ * Only single slot assignment on uplink direction
+ * No half-duplex class support (only semi-duplex)
+ * No TA loop
+ * No power loop