Add iOS sample app readme

connections/swift/NearbyConnections/Example/README.md

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+# Nearby Connections iOS Example
+
+A sample app for using Nearby Connections in iOS.
+
+## Setup
+1. Clone the Nearby repo with all submodules by running the following command:
+
+   ```bash
+   git clone --recurse-submodules https://github.com/google/nearby.git
+   ```
+
+2. Open the sample app in Xcode:
+
+   ```bash
+   open nearby/connections/swift/NearbyConnections/Example/iOS\ Example.xcodeproj
+   ```
+
+3. Choose a development team by navigating to `iOS Example` > `iOS Example` under "Targets" > `Signing & Capabilities` and then choosing your team from the "team" drop-down:
+
+   ![development team](../Resources/development-team.png)
+
+
+## Run the App
+
+The app can be run pressing the "run" button or the <kbd>Command</kbd> + <kbd>R</kbd> keyboard shortcut:
+
+![run](../Resources/run.png)