docs: added entity spawn example

docs/src/Examples/EntitySpawning.md

@@ -0,0 +1,28 @@
+## Entity spawning
+
+Assuming you created a component and registered it using the following rust snippets.
+
+```rust,ignore
+#[derive(Component, Reflect, Default)]
+#[reflect(Component)]
+pub struct MyType {
+    value: f32,
+}
+```
+
+```rust,ignore
+app.register_type::<MyType>();
+```
+
+In lua you can construct a MyType instance and attach it to an entity.
+
+```lua
+local MyType = types.MyType
+
+function on_script_loaded()
+    local instance = construct(MyType, { value = 50.0 })
+    local entity = world.spawn()
+    world.insert_component(entity, MyType, instance)
+    print("Entity with component value: " .. world.get_component(entity, MyType).value)
+end
+```

docs/src/SUMMARY.md

@@ -12,6 +12,7 @@
 - [Script ID Mapping](./Summary/script-id-mapping.md)
 - [Script Systems](./ScriptSystems/introduction.md)
 - [Examples](./Examples/introduction.md)
+    - [Entity spawning](./Examples/EntitySpawning.md)
 
 # Scripting Reference