fix: add generate-pwa-assets instructions

platforms/web/README.md

@@ -10,8 +10,20 @@
 - Lint through `yarn lint` (eslint, prettier, stylelint and tsc checks)
 - Run `yarn start`
 
+## Create favicons / pwa icons
+
+First override the source icon with another image here [./public/images/icons/app-icon.png`](./public/images/icons/app-icon.png)
+Use a high quality image square-sized image. We suggest a dimension 1024x1024 or higher
+
+- Navigate to the platform directory `cd platforms/web`
+- Perform `yarn generate-pwa-assets`
+
+Instal `sharp` if you get the following error: Could not load the "sharp" module using the ... runtime.
+And run `yarn generate-pwa-assets` afterwards
+
+The different icon formats are defined here [pwa-assets.config.ts](./pwa-assets.config.ts)
+
 ## Developer guidelines
 
 - Read the workspace guidelines here [../../docs/developer-guidelines.md](../../docs/developer-guidelines.md).
 - Read the web platform guidelines here [./docs/developer-guidelines.md](./docs/developer-guidelines.md).
-