add documentation, especially for build processes

README.md

@@ -31,7 +31,9 @@ See [TESTING.md](test-playwright/TESTING.md) for detailed test instructions.
 
 ## Icons
 
-To add an icon, add to main.ts and reference with `fa` element and `icon` attribute with the hyphenated name.
+Application icons are in the `assets` directory, processed by the `capacitor-assets` command.
+
+To add a Font Awesome icon, add to main.ts and reference with `font-awesome` element and `icon` attribute with the hyphenated name.
 
 ## Other