fix docs

Author: jakobhellermann

README.md

@@ -4,6 +4,25 @@
 
 Live playground: [jakobhellermann.github.io/bevy_mod_debugdump](https://jakobhellermann.github.io/bevy_mod_debugdump)
 
+```rust
+use bevy::prelude::*;
+use bevy::log::LogPlugin;
+
+fn main() {
+    App::new()
+        .add_plugins(DefaultPlugins)
+        .add_plugins(bevy_mod_debugdump::CommandLineArgs)
+        .run()
+}
+```
+
+```
+cargo run -- --dump-update-schedule
+
+Usage: [--dump-update-schedule file] [--dump-render file] [--no-exit]
+```
+
+
 ## Schedule graph
 
 ```rust

src/lib.rs

@@ -100,8 +100,7 @@ pub fn print_render_graph(app: &mut App) {
 ///
 /// ## Exit the app
 ///
-/// Use `--exit` to exit the app. This may be useful if one wants to create
-/// these graphs in script.
+/// By default the app will exit after performing the dump. If you want to keep the app running, use `--no-exit`.
 ///
 /// # Usage
 ///