1. Open shortcuts app and tap on "+" icon in top right
2. Tap "Add Action"
3. Tap "Scripting"
4. Tap on "Open App" and choose an app
5. Tap the share button in the lower right corner
6. Tap on add to homescreen
7. Tap the icon button and it'll bring up the option to choose your icon — you can choose from your Files app or Photos app, depending on where you saved your icons
8. Tap on "Add" in the top right and it'll add it to your homescreen
9. Give your icon a name, then press "Add/Done" in the top right corner
