add more build instructions for iOS

BUILDING.md

@@ -9,8 +9,19 @@ For a quick dev environment setup, use [pkgx](https://pkgx.dev).
 - Node.js (LTS version recommended)
 - npm (comes with Node.js)
 - Git
-- For iOS builds: macOS with Xcode installed
 - For Android builds: Android Studio with SDK installed
+- For iOS builds: macOS with Xcode and ruby gems & bundle
+  - pkgx +rubygems.org sh
+
+  - ... and you may have to fix these, especially with pkgx
+
+   ```bash
+   gem_path=$(which gem)
+   shortened_path="${gem_path:h:h}"
+   export GEM_HOME=$shortened_path
+   export GEM_PATH=$shortened_path
+   ```
+
 - For desktop builds: Additional build tools based on your OS
 
 ## Forks
@@ -22,7 +33,7 @@ If you have forked this to make your own app, you'll want to customize the iOS &
    npx cap add ios
    ```
 
-You'll also want to edit the deep link configuration.
+You'll also want to edit the deep link configuration (see below).
 
 ## Initial Setup
 
@@ -59,7 +70,7 @@ To build for web deployment:
 
 ## Desktop Build (Electron)
 
-### Building for Linux
+### Linux Build
 
 1. Build the electron app in production mode:
 
@@ -142,6 +153,12 @@ Prerequisites: macOS with Xcode installed
 
 4. Use Xcode to build and run on simulator or device.
 
+### First-time iOS Configuration
+
+- Generate certificates inside XCode.
+
+- Right-click on App and under Signing & Capabilities set the Team.
+
 ### Android Build
 
 Prerequisites: Android Studio with SDK installed
@@ -174,7 +191,7 @@ Prerequisites: Android Studio with SDK installed
 
 5. Use Android Studio to build and run on emulator or device.
 
-## Building Android from the console
+## Android Build from the console
 
    ```bash
    cd android
@@ -191,7 +208,7 @@ Prerequisites: Android Studio with SDK installed
    ```
 
 
-## Configuring Android for deep links
+## First-time Android Configuration for deep links
 
 You must add the following intent filter to the `android/app/src/main/AndroidManifest.xml` file: