Add mobile docs

docs/mobile.md

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+sidebar_position: 13
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+# Mobile
+
+When integrating Topper on a mobile app, or either you open Topper on a **user's browser**, where no extra configuration is required, or embed it in a **WebView**.
+
+When embedding on a **WebView**, please ensure the following:
+
+- set the correct parameters referenced on [Single Sign-On](./single-sign-on.md#mobile-app) and [Digital Wallets](./digital-wallets.md#mobile-app).
+- configure the **WebView** to support **Cloudflare Turnstile**.
+- configure camera and audio app permissions to support **Veriff**.
+
+## Cloudflare Turnstile
+
+We use **Clouflare Turnstile** to confirm users are real and to block unwanted bots without slowing down the experience, so please be sure to follow this [Webview configurations](https://developers.cloudflare.com/turnstile/get-started/mobile-implementation/#webview-configurations) and [update the allowed origins](https://developers.cloudflare.com/turnstile/get-started/mobile-implementation/#update-allowed-origins) to account for `challenges.cloudflare.com, about:blank, about:srcdoc` and enable `https` and `http` connections.
+
+If you use `react-native-webview` package update your **WebView** `originWhitelist` as `originWhitelist={['https://*', 'http://*', 'about:blank', 'about:srcdoc']}`.
+
+If you use Flutter, Turnstile is [compatible and tested](https://developers.cloudflare.com/turnstile/get-started/mobile-implementation/#use-flutter-with-turnstile) with Flutter’s **WebView** implementation.