feat(plugin): add expo config plugin for google auth

[sbaiahmed1]

Closes : #3

• Plugin setup with TypeScript
• Configuration for iOS Info.plist and Android manifest
• Client ID handling from Google services files
• Workspace and package configuration updates

[sourcery-ai]

Reviewer's Guide

This PR introduces a TypeScript-based Expo Config Plugin for react-native-google-auth, wiring up native iOS and Android projects by copying Google config files, auto-detecting client IDs, and injecting URL schemes, GIDClientID keys and permissions via withInfoPlist and withAndroidManifest, alongside monorepo package and documentation updates for Expo integration.

Sequence diagram for Expo plugin configuration process

sequenceDiagram
  participant Dev as actor Developer
  participant Expo as "Expo CLI"
  participant Plugin as "Config Plugin (withReactNativeGoogleAuth)"
  participant Native as "Native Project (iOS/Android)"
  Dev->>Expo: Run build (eas build, etc.)
  Expo->>Plugin: Load config plugin with options
  Plugin->>Native: Copy Google config files
  Plugin->>Native: Inject client IDs and permissions
  Native->>Plugin: Confirm configuration
  Plugin->>Expo: Return configured project

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Class diagram for Expo config plugin types and main entry point

classDiagram
  class GoogleAuthPluginOptions {
    iosClientId: string
    androidClientId: string
    googleServicesFile: string
    iosGoogleServicesFile: string
  }
  class withGoogleAuth {
    +ConfigPlugin<GoogleAuthPluginOptions>
    +copyFileWithErrorHandling()
    +getIosClientIdFromPlist()
    +getAndroidClientIdFromJson()
  }
  class withReactNativeGoogleAuth {
    +ConfigPlugin<GoogleAuthPluginOptions>
  }
  withReactNativeGoogleAuth --> withGoogleAuth : uses
  withGoogleAuth ..> GoogleAuthPluginOptions : options

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File-Level Changes

Change	Details	Files
Add Expo Config Plugin package scaffolding	Create new plugin package with its own package.json and tsconfig.json Add plugin entrypoint in plugin/src/index.ts using withPlugins to apply config steps	plugin/package.json plugin/tsconfig.json plugin/src/index.ts
Implement Config Plugin logic for native platforms	Copy GoogleService-Info.plist and google-services.json into iOS and Android projects Extract client IDs from plist/JSON and insert into Info.plist (GIDClientID, URL schemes) Modify AndroidManifest to add INTERNET permission and prepare for Google Auth	plugin/src/withGoogleAuth.ts
Update monorepo package configuration and documentation	Register plugin in root package.json (plugin field, workspaces) Revise README.md to document Expo Config Plugin and update Quick Start/Platform Setup sections	package.json README.md

Possibly linked issues

• #53: The PR introduces an Expo config plugin, which directly resolves the issue's reported build error caused by the absence of such a plugin for react-native-google-auth.

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