Add usage example to README (#40)

Co-authored-by: Vicente Lermanda <vlermanda@MacBook-Air-2.local>

README.md

@@ -47,10 +47,19 @@ manual page.
 
 ## Usage
 
+### List the content from current directory
+
 ```bash
 $ ls | choose
 ```
 
+### Open apps from the applications directories
+
+```bash
+$ ls /Applications/ /Applications/Utilities/ /System/Applications/ /System/Applications/Utilities/ | \
+$ grep '\.app$' | sed 's/\.app$//g' | choose | xargs -I {} open -a "{}.app"
+```
+
 ## License
 
 See [MIT LICENSE](./LICENSE).