README: Major update

* convert to markdown syntax
* bring in-line with other osmo-* README.md files, in terms of
  links to git, mailing list, manuals, etc.

Change-Id: Ia4a4329c6ef6b8c833aa26832776dad662cdc7e9

3 files changed, 82 insertions, 18 deletions

diff --git a/README b/README
deleted file mode 100644
index a14ba3803..000000000
--- a/README
+++ /dev/null
@@ -1,17 +0,0 @@
-About OsmoSGSN
-==============
-
-OsmoSGSN originated from the OpenBSC project, as a separate program within
-openbsc.git. In 2017, OpenBSC was split in separate repositories, and hence
-OsmoSGSN was given its own separate git repository.
-
-OsmoSGSN exposes
-- GSUP towards OsmoHLR (or a MAP proxy);
-- GTP towards a GGSN (e.g. OsmoGGSN);
-- Gb towards a BSS (e.g. OsmoPCU);
-- IuPS towards an RNC or HNB-GW (e.g. OsmoHNBGW) for 3G data;
-- The Osmocom typical telnet VTY and CTRL interfaces.
-
-Find OsmoSGSN issue tracker and wiki online at
-https://osmocom.org/projects/osmosgsn
-https://osmocom.org/projects/osmosgsn/wiki
diff --git a/README.md b/README.md
new file mode 100644
index 000000000..607b05d4b
--- /dev/null
+++ b/README.md
@@ -0,0 +1,81 @@
+osmo-sgssn - Osmocom SGSN Implementation
+========================================
+
+This repository contains a C-language implementation of a GSM Serving GPRS
+Support Node (SGSN) for 2G (GSM) and 3G (UMTS).  It is part of the
+[Osmocom](https://osmocom.org/) Open Source Mobile Communications
+project.
+
+OsmoSGSN exposes
+ * Gb towards PCUs (e.g. OsmoPCU): Various GbIP flavors + Gb/FR/E1
+ * GTP towards a GGSN (e.g. OsmoGGSN);
+ * IuPS over IP towards RNCs / HNBGW (e.g. osmo-hnbgw)
+ * The Osmocom typical telnet VTY and CTRL interfaces.
+ * The Osmocom typical statsd exporter.
+ * GSUP (custom MAP-like protocol) towards osmo-hlr
+
+OsmoSGSN implements
+ * GPRS mobility management
+ * GPRS session management
+
+Homepage
+--------
+
+You can find the OsmoSGSN issue tracker and wiki online at
+<https://osmocom.org/projects/osmosgsn> and <https://osmocom.org/projects/osmosgsn/wiki>.
+
+
+GIT Repository
+--------------
+
+You can clone from the official osmo-sgsn.git repository using
+
+        git clone https://gitea.osmocom.org/cellular-infrastructure/osmo-sgsn
+
+There is a web interface at <https://gitea.osmocom.org/cellular-infrastructure/osmo-sgsn>
+
+
+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/osmosgsn-usermanual.pdf)
+as well as the [VTY Reference Manual](https://ftp.osmocom.org/docs/latest/osmosgsn-vty-reference.pdf)
+
+
+Mailing List
+------------
+
+Discussions related to osmo-sgsn are happening on the
+osmocom-net-gprs@lists.osmocom.org mailing list, please see
+<https://lists.osmocom.org/postorius/lists/osmocom-net-gprs.lists.osmocom.org/> 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-sgsn can be seen at
+<https://gerrit.osmocom.org/#/q/project:osmo-sgsn+status:open>
+
+
+History
+-------
+
+OsmoSGSN originated from the OpenBSC project, as a separate program within
+openbsc.git. In 2017, OpenBSC was split in separate repositories, and hence
+OsmoSGSN was given its own separate git repository.
diff --git a/contrib/osmo-sgsn.spec.in b/contrib/osmo-sgsn.spec.in
index 9cf18f6dc..daedf06b3 100644
--- a/contrib/osmo-sgsn.spec.in
+++ b/contrib/osmo-sgsn.spec.in
@@ -93,7 +93,7 @@ make %{?_smp_mflags}
 make %{?_smp_mflags} check || (find . -name testsuite.log -exec cat {} +)
 
 %files
-%doc AUTHORS README
+%doc AUTHORS README.md
 %dir %{_docdir}/%{name}/examples
 %dir %{_docdir}/%{name}/examples/osmo-sgsn
 %exclude %{_docdir}/%{name}/examples/osmo-gtphub