Make a plugin

src/main.rs

@@ -1,5 +1,16 @@
 use bevy::prelude::*;
 
+pub struct GamarjobaPlugin;
+
+impl Plugin for GamarjobaPlugin {
+    fn build(&self, app: &mut App) {
+        app.add_startup_system(add_people)
+            .add_system(gamarjoba)
+            .add_system(greetings);
+    }
+    
+}
+
 #[derive(Component)]
 struct Person;
 
@@ -28,8 +39,6 @@ fn gamarjoba() {
 fn main() {
     App::new()
         .add_plugins(DefaultPlugins)
-        .add_startup_system(add_people)
+        .add_plugin(GamarjobaPlugin)
-        .add_system(greetings)
-        .add_system(gamarjoba)
         .run();
 }