Merge pull request #3 from passageidentity/PSG-3807-add-readme

Create README.md

README.md

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+<img src="https://storage.googleapis.com/passage-docs/passage-logo-gradient.svg" alt="Passage logo" style="width:250px;"/>
+
+### Native passkey authentication for your iOS app
+## Welcome!
+Integrating passkey technology can be really hard. That's why we built the PassageFlex iOS SDK - to make passkey authentication easy for you and your users.
+<br>
+
+## Usage
+
+### Installation
+
+You can import the PassageFlex via the Swift Package Manager. Simply search SPM for this url:
+```
+https://github.com/passageidentity/passage-flex-ios
+```
+Or you can import it using CocoaPods by add this pod to your app's Podfile:
+```
+pod 'PassageFlex'
+```
+
+### Example
+And you can use it like this:
+```swift
+import PassageFlex
+
+let nonce = try await PassageFlex.Passkey.authenticate()
+```
+<br>
+
+## Documentation
+To get started using PassageFlex in your iOS app, please visit our [Passage Docs](https://docs.passage.id/mobile/ios/).