Change windows by macos, how to use AppImage and supported mime-types

.github/workflows/main.yml

@@ -15,7 +15,7 @@ jobs:
 
     strategy:
       matrix:
-        os: [windows-latest, ubuntu-latest]
+        os: [macos-latest, ubuntu-latest]
 
     steps:
        - name: Checkout

README.md

@@ -1,3 +1,8 @@
+[![Gitter chat](https://badges.gitter.im/gitterHQ/gitter.png)](https://gitter.im/ada-lang/Lobby)
+[![Build](https://github.com/mgrojo/open_url/actions/workflows/main.yml/badge.svg)](https://github.com/mgrojo/open_url/actions/workflows/main.yml)
+[![Download][download-img]][download]
+
+
 [![Gitter chat](https://badges.gitter.im/gitterHQ/gitter.png)](https://gitter.im/ada-lang/Lobby)
 
 `open_url` is a small utility to open "*.url" files under GNU/Linux.
@@ -26,7 +31,16 @@ alr install
 Refer to Alire documentation on how to add the Alire default installation to the PATH variable
 or how  to change the default installation prefix.
 
-# How to run
+# Use a pre-built AppImage version
+
+You can download a pre-build AppImage from the Releases section in GitHub. For using the file,
+give it execution permissions and rename it to `open_url`.
 ```sh
+mv Open_URL-x86_64.AppImage open_url
+chmod +x open_url
+```
+
+# How to run
+```
 Usage: open_url <file.url>
 ```

open_url.desktop

@@ -4,6 +4,7 @@ Comment=Open *.url files under Linux
 Exec=open_url
 Icon=open_url
 Terminal=false
+X-MultipleArgs=false
 Type=Application
 Categories=Utility
-
+MimeType=application/x-mswinurl;