[gnome-dictionary] docs: Update README file

[Emmanuele Bassi <ebassi src gnome org>]

commit c3460555a2a5ab7f86e3efd625dc8a9b481744ec
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Wed Aug 23 15:33:05 2017 +0100

    docs: Update README file

 README    |   25 -------------------------
 README.md |   44 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 44 insertions(+), 25 deletions(-)
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+GNOME Dictionary
+===============================================================================
+
+### Look up words in dictionary sources.
+
+GNOME Dictionary is a simple, clean, elegant application to look up words in
+online dictionaries using the [DICT][dict-rfc] protocol.
+
+## Building Dictionary
+
+In order to build GNOME Dictionary you will need:
+
+  - a C99 compatible compiler
+  - Python 3
+  - [Ninja](https://ninja-build.org)
+  - [Meson](http://mesonbuild.com)
+
+You will also need the development files for:
+
+  - GLib 2.x
+  - GTK+ 3.x
+
+After cloning the `gnome-dictionary` repository, enter the source directory
+and configure the project using:
+
+```sh
+$ meson _build .
+```
+
+Where `_build` is the location where the build artefacts should be placed.
+After the configuration succeeds, you can build, test, and install GNOME
+Dictionary using:
+
+```sh
+$ cd _build
+$ ninja
+$ meson test
+$ sudo ninja install           # Will install under /usr/local by default
+```
+
+If you wish to install in a different prefix, use the `--prefix` command
+line option for `meson`.
+
+[dict-rfc]: https://tools.ietf.org/html/rfc2229