add README.md file as customary for cgit, github, gitlab, etc.

Change-Id: Ide03584aae21d5972e96e7862feb86e1265c29b3

README.md

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+osmo-hlr - Osmocom HLR Implementation
+=====================================
+
+This repository contains a C-language implementation of a GSM Home
+Location Register (HLR). It is part of the
+[Osmocom](https://osmocom.org/) Open Source Mobile Communications
+project.
+
+Warning: While the HLR logical functionality is implemented, OsmoHLR
+does not use the ETSI/3GPP TCAP/MAP protocol stack. Instead, a much
+simpler custom protocol (GSUP) is used.  This means, OsmoHLR is of
+no use outside the context of an Osmocom core network.  You can use
+it with OsmoMSC, OsmoSGSN etc. - but not with third party components.
+
+Homepage
+--------
+
+The official homepage of the project is
+https://osmocom.org/projects/osmo-hlr/wiki
+
+GIT Repository
+--------------
+
+You can clone from the official osmo-hlr.git repository using
+
+	git clone git://git.osmocom.org/osmo-hlr.git
+	git clone https://git.osmocom.org/osmo-hlr.git
+
+There is a cgit interface at https://git.osmocom.org/osmo-hlr/
+
+Documentation
+-------------
+
+User Manuals and VTY reference manuals are [optionally] built in PDF form
+as part of the build process.
+
+Pre-rendered PDF version of the current "master" can be found at
+[User Manual](https://ftp.osmocom.org/docs/latest/osmohlr-usermanual.pdf)
+as well as the VTY reference manuals
+* [VTY Reference Manual for osmo-hlr](https://ftp.osmocom.org/docs/latest/osmohlr-vty-reference.pdf)
+
+Mailing List
+------------
+
+Discussions related to osmo-hlr 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.
+
+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-hlr can be seen at
+https://gerrit.osmocom.org/#/q/project:osmo-hlr+status:open