add user guide and update readme

README.md

@@ -1,6 +1,21 @@
 # Pinafore
 
-An alternative web client for [Mastodon](https://joinmastodon.org]).
+An alternative web client for [Mastodon](https://joinmastodon.org]), focused on speed and simplicity.
+
+Pinafore is available at [pinafore.social](https://pinafore.social).
+
+For bleeding-edge dev releases, there is also [dev.pinafore.social](https://dev.pinafore.social).
+
+## Browser support
+
+Pinafore supports the latest versions of the following browsers:
+
+- Chrome
+- Edge
+- Firefox
+- Safari
+
+Compatible versions of each (Opera, Brave, Samsung, etc.) should be fine.
 
 ## Goals and non-goals
 

docs/User-Guide.md

@@ -0,0 +1,34 @@
+This will walk you through the basic usage of Pinafore and its major differences with the Mastodon web UI.
+
+## Home page
+
+The home page is both where you write toots and where you read your home timeline:
+
+![Screenshot of home page](https://github.com/username/repository/blob/master/docs/Screenshot1.png)
+
+When you scroll down, the "toot" button transforms into a "compose" button:
+
+![Screenshot showing home page scrolled down](https://github.com/username/repository/blob/master/docs/Screenshot2.png)
+
+If you press this compose button, you can toot anywhere in your home timeline.
+
+![Screenshot showing compose box in a modal dialog](https://github.com/username/repository/blob/master/docs/Screenshot3.png)
+
+## Community page
+
+By default, the Local Timeline is pinned to the top navigation. In the "Community" section, you can view
+Lists, the Local Timeline, the Federated Timeline, and your Favorites, and you can also pin any of these to
+the top navigation.
+
+![Screenshot of Community page with options to pin multiple timelines](https://github.com/username/repository/blob/master/docs/Screenshot4.png)
+
+## Multiple instances
+
+You can manage you instances in the settings:
+
+![Screenshot of instance settings with a list of instances](https://github.com/username/repository/blob/master/docs/Screenshot5.png)
+
+For each instance, you can choose a custom theme so that it's easy to 
+remember which instance you're currently using:
+
+![Screenshot of instance configuration with multiple themes available](https://github.com/username/repository/blob/master/docs/Screenshot6.png)