View source for Adding app on gnome menu

create myapp.desktop file

 nano ~/.local/share/applications/myapp.desktop

Write all the configurations

 [Desktop Entry]
 Version=1.0
 Name=MyApp
 Comment=This is my custom app
 Exec=/path/to/your/binary
 Icon=/path/to/your/icon.png
 Terminal=false
 Type=Application
 Categories=Utility;Application;

* <code>Version</code>: (Optional) Specifies the version of the desktop entry format.
* <code>Name</code>: The name of your application that will appear in the GNOME menu.
* <code>Comment</code>: A short description of your app.
* <code>Exec</code>: The command that will run your application. Use the full path to your binary or executable.
* <code>Icon</code>: The path to your application’s icon file.
* <code>Terminal</code>: Whether or not to open the app in a terminal (<code>false</code> for GUI apps).
* <code>Type</code>: Should always be <code>Application</code> for an app.
* <code>Categories</code>: Categories help categorize the app in the menu, such as <code>Utility</code>, <code>Development</code>, <code>Graphics</code>, etc. You can add multiple categories, separated by semicolons.

Reload gtk cache
 gtk-update-icon-cache