Add example readme

example/README.md

@@ -0,0 +1,5 @@
+# Viam SDK Examples
+
+This directory contains examples on how to use the Viam Flutter SDK.
+
+- [Viam Example App](https://github.com/viamrobotics/viam-flutter-sdk/tree/main/example/viam_example_app)

example/viam_example_app/README.md

@@ -1,3 +1,22 @@
 # Viam Example Flutter App
 
-This example app uses Viam's Flutter SDK to connect to and control a robot. It was created using VSCode's Flutter plugin.
+This example app uses Viam's Flutter SDK to connect to and control a robot. It was created using VSCode's Flutter plugin and shows the basic use cases for how the Viam Flutter SDK can be used to connect to, view, and control your robot.
+
+## Setup
+
+In this directory (the main project directory) create a `.env` file with the following fields:
+
+```
+ROBOT_LOCATION=<ROBOT_LOCATION_URI>
+LOCATION_SECRET=<ROBOT_LOCATION_SECRET>
+```
+
+Both these fields can be obtained from your robot's `Code Sample` tab on [app.viam.com](https://app.viam.com).
+
+## Run
+
+Run `lib/main.dart`:
+
+```
+flutter run lib/main.dart
+```