Add screenshots in README

Author: pvigier

README.md

@@ -4,7 +4,7 @@ gitamine is a modern graphical user interface for Git. It is open-source, multip
 
 The main features of gitamine are:
 
-* Beatiful and readable commit graph
+* Beautiful and readable commit graph
 * Syntax highlighting
 * Themeable (light and dark modes available)
 * Automatic refresh
@@ -22,20 +22,21 @@ gitamine is powered by awesome technologies including:
 
 ## Downloads
 
-Coming soon.
+You can download the latest version of gitamine [here](https://github.com/pvigier/gitamine/releases/latest).
 
 ## Contributing
 
 Here are some ways, you can contribute to gitamine:
 
-* Found a bug, please create an issue, we will try fix it as quickly as possible.
+* Found a bug, please create an issue, I will try fix it as quickly as possible.
 * Want to fix an issue or add a feature yourself, do a pull request.
-* If you are a designer, gitamine needs an application icon and some icons for the user interface, you are more than welcomed.
+* If you are a designer, gitamine needs an application icon and some icons for the user interface, you are more than welcome.
 * If you want to become an active maintainer, please contact me.
 
 ## Screenshots
 
-Coming soon.
+![Screenshot of graph viewer](https://user-images.githubusercontent.com/934316/52978316-09605380-33d1-11e9-97ed-38289f976815.png)
+![Screenshot of patch viewer](https://user-images.githubusercontent.com/934316/52978324-111ff800-33d1-11e9-998a-4ac968711a85.png)
 
 ## License