[glib-networking] Add some minimal content to the README

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 52da659639a769d6bb9b0d5a3e9cce525d25a8bb
Author: Michael Catanzaro <mcatanzaro posteo net>
Date:   Tue Sep 25 17:55:40 2018 +0000

    Add some minimal content to the README
    
    Mostly copied from the doap. Better than no README.

 README | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)
---
diff --git a/README b/README
index 623bd75..6269242 100644
--- a/README
+++ b/README
@@ -1,4 +1,13 @@
-Network-related giomodules for glib.
+Network-related giomodules for glib
+
+glib-networking contains the implementations of certain GLib networking features
+that cannot be implemented directly in GLib itself because of their
+dependencies.
+
+Currently it contains GnuTLS and OpenSSL-based implementations of GTlsBackend, 
+a libproxy-based implementation of GProxyResolver, GLibproxyResolver,
+and a GNOME GProxyResolver that uses the proxy information from the GSettings
+schemas in gsettings-desktop-schemas.
 
 File bugs against
 https://gitlab.gnome.org/GNOME/glib-networking/issues/new