[jsonrpc-glib] update README.md

[Christian Hergert <chergert src gnome org>]

commit 9be9644385b124e438019fa363306d399791b353
Author: Christian Hergert <chergert redhat com>
Date:   Sun Jun 18 20:13:29 2017 -0700

    update README.md

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+# Jsonrpc-GLib
+
+Jsonrpc-GLib is a library to communicate with JSON-RPC based peers in either a synchronous or asynchronous 
fashion.
+It also allows communicating using the GVariant serialization format instead of JSON when both peers support 
it.
+You might want that when communicating on a single host to avoid parser overhead and memory-allocator 
fragmentation.
+
+## Building
+
+We use the Meson build system for building jsonrpc-glib.
+
+```sh
+# Some common options
+meson --prefix=/opt/gnome --libdir=/opt/gnome/lib -Denable_gtk_doc=true build
+cd build
+ninja install
+```
+
+## Documentation
+
+You can read the documentation online at https://people.gnome.org/~chergert/docs/jsonrpc-glib/
+