[gnome-documents] README: Use detailed markdown README

[Christopher Davis <christopherdavis src gnome org>]

commit 9c24ef0406f5f361db39fade09821d4829709376
Author: Christopher Davis <brainblasted disroot org>
Date:   Sun Mar 3 04:46:31 2019 -0500

    README: Use detailed markdown README
    
    Previously we had a sparse README that just pointed to the
    wiki. While wikis are great, the README is where effort
    should be put for a first impression.
    
    Added some useful links, tutorials, and communication tips
    for potential contributors.

 README    |  2 --
 README.md | 31 +++++++++++++++++++++++++++++++
 2 files changed, 31 insertions(+), 2 deletions(-)
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+# GNOME Documents
+
+A document manager application for GNOME.
+
+<a href='https://flathub.org/apps/details/org.gnome.Documents'><img width='240' alt='Download on Flathub' 
src='https://flathub.org/assets/badges/flathub-badge-i-en.png'/></a>
+
+## Useful links
+
+**Homepage**: https://wiki.gnome.org/Apps/Documents
+
+**Report issues**: https://gitlab.gnome.org/GNOME/gnome-documents/issues/
+
+**Donate**: https://www.gnome.org/friends/
+
+**Translate**: https://wiki.gnome.org/TranslationProject
+
+## Hacking on Documents
+
+To start working on Documents see the [general guide](https://wiki.gnome.org/Newcomers/BuildProject) for 
building GNOME apps
+with Flatpak and GNOME Builder. Then, [find a 
task](https://gitlab.gnome.org/GNOME/gnome-documents/issues?label_name%5B%5D=4.+Newcomers) to work on.
+
+If you're unfamiliar with GJS, here are a few good places to start:
+
+* The [beginner-level guide](https://gjs-guide.gitlab.io/) for working with GJS
+* An overview of [working with GNOME APIs via GJS](https://gitlab.gnome.org/GNOME/gjs/wikis/Mapping)
+* The [documentation for various GNOME libraries](https://devdocs.baznga.org/) in JavaScript
+
+## Communication
+
+If you need help, contact us at 
[#gnome-documents:disroot.org](https://matrix.to/#/#gnome-documents:disroot.org) on Matrix. If you need a 
client,
+we recommend using [Fractal](https://flathub.org/apps/details/org.gnome.Fractal), a Matrix app built for 
GNOME.
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