Add Example/README.md and update dependencies (#10)

Author: eilzo

example/README.md

@@ -0,0 +1,22 @@
+## Installation
+```sh
+dart pub global activate flutterflow_cli
+```
+
+## How to use
+
+Base command with required flags:
+```sh
+flutterflow export-code --project ProjectID --token APIToken
+```
+See [README](https://pub.dev/packages/flutterflow_cli) for the full list of available flags.
+
+## Setting API Token Variable
+
+Your API Token can be added as the environment variable `FLUTTERFLOW_API_TOKEN`. This means you don't have to manually pass the `--token` flag. 
+
+See your corresponding operating system guide:
+
+* [MacOS](https://support.apple.com/en-gb/guide/terminal/apd382cc5fa-4f58-4449-b20a-41c53c006f8f/mac)
+* [Linux](https://linuxize.com/post/how-to-set-and-list-environment-variables-in-linux/#persistent-environment-variables)
+* [Windows](https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_environment_variables?view=powershell-7.4#saving-environment-variables-with-the-system-control-panel)

pubspec.yaml

@@ -11,7 +11,7 @@ environment:
 dependencies:
   archive: ^3.3.5
   args: ^2.3.0
-  http: ^0.13.5
+  http: ^1.1.0
   path: ^1.8.0
 
 dev_dependencies: