[gnome-weather] Add README.md

[Christopher Davis <christopherdavis src gnome org>]

commit 082a19f5bfd3f6e5c4003d0c6d4748b006ac23d1
Author: Christopher Davis <brainblasted disroot org>
Date:   Tue Oct 22 11:16:06 2019 -0700

    Add README.md
    
    This gives useful information to anyone coming to the page to look for help or to contribute.

 README.md | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
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+# Weather
+
+Monitor the current weather conditions for your city, or anywhere in the world.
+
+## Useful links
+
+**Homepage**: https://wiki.gnome.org/Apps/Weather
+
+**Report issues**: https://gitlab.gnome.org/GNOME/gnome-weather/issues/
+
+**Donate**: https://www.gnome.org/friends/
+
+**Translate**: https://wiki.gnome.org/TranslationProject
+
+## Installation
+
+There are two supported ways to install Weather:
+
+### Stable Release
+
+The latest stable release is available on Flathub:
+
+<a href='https://flathub.org/apps/details/org.gnome.Weather'><img width='240' alt='Download on Flathub' 
src='https://flathub.org/assets/badges/flathub-badge-i-en.png'/></a>
+
+### Development Snapshot
+
+This is for testing only. To start, add the GNOME nightly repository:
+
+```
+$ flatpak remote-add gnome-nightly https://nightly.gnome.org/gnome-nightly.flatpakrepo
+```
+
+Then, run the following command to install the development version of Weather:
+
+```
+$ flatpak install org.gnome.WeatherDevel
+```
+
+## Hacking on Weather
+
+To start working on Weather 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-weather/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 want to chat with the maintainers, we're on Matrix at 
[#gnome-weather:disroot.org](https://matrix.to/#/#gnome-weather:disroot.org)
+