add example

Cargo.toml

@@ -190,6 +190,11 @@ name = "function_return_value_ruby"
 path = "examples/ruby/function_return_value.rs"
 required-features = ["ruby"]
 
+[[example]]
+name = "hello_world_ruby"
+path = "examples/ruby/hello_world.rs"
+required-features = ["ruby"]
+
 
 [dev-dependencies]
 tracing-subscriber = "0.3.18"

assets/examples/ruby/hello_world.rb

@@ -0,0 +1 @@
+hello_bevy()

examples/ruby/hello_world.rs

@@ -0,0 +1,21 @@
+use bevy::prelude::*;
+use bevy_scriptum::prelude::*;
+use bevy_scriptum::runtimes::ruby::prelude::*;
+
+fn main() {
+    App::new()
+        .add_plugins(DefaultPlugins)
+        .add_scripting::<RubyRuntime>(|runtime| {
+            runtime.add_function(String::from("hello_bevy"), || {
+                println!("hello bevy, called from script");
+            });
+        })
+        .add_systems(Startup, startup)
+        .run();
+}
+
+fn startup(mut commands: Commands, assets_server: Res<AssetServer>) {
+    commands.spawn(Script::<RubyScript>::new(
+        assets_server.load("examples/ruby/hello_world.rb"),
+    ));
+}