docs: add install pwa to ipad

Author: jsjoeio

doc/ipad.md

@@ -3,6 +3,7 @@
 # iPad
 
 - [Known Issues](#known-issues)
+- [How to install PWA](#how-to-install-pwa)
 - [How to access code-server with a self signed certificate on iPad?](#how-to-access-code-server-with-a-self-signed-certificate-on-ipad)
   - [Servediter iPad App](#servediter-ipad-app)
 - [Raspberry Pi USB-C Network](#raspberry-pi-usb-c-network)
@@ -28,6 +29,16 @@
   - Alternative: Just use touch scrolling
 - See [issues tagged with the iPad label](https://github.com/cdr/code-server/issues?q=is%3Aopen+is%3Aissue+label%3AiPad) for more.
 
+## How to install PWA
+
+To install the code-server PWA, follow these steps:
+
+1. Open code-server in Safari
+2. Click the Share icon
+3. Click "Add to Home Screen"
+
+Now when you open code-server from the home screen, you will be using the PWA. The advantages of this are more screen real estate and access to top-level keyboard shortcuts because it's running like an app.
+
 ## How to access code-server with a self signed certificate on iPad?
 
 Accessing a self signed certificate on iPad isn't as easy as accepting through all