Add code statement migration guide

CHANGELOG.md

@@ -1,5 +1,11 @@
 # 0.10.0
 
+## Minor breaking changes:
+
+- `cuicui_chirp`: the `wraparg` module is now `parse_dsl::args`
+- `cuicui_chirp`: Removed `ChirpInstances`, now that the root entity is preserved,
+  you can directly interact with it instead of using a resource. f
+
 ## `cuicui_dsl` & `cuicui_chirp`: Major DSL syntax change
 
 The DSL syntax has gotten a lifting!
@@ -88,6 +94,63 @@ Colors {
 }
 ```
 
+## `cuicui_dsl`: Change in behavior of the `code` statements
+
+Now that statements require to be associated to a single entity, `code` statements
+are now much less powerful.
+
+Previously, you would write:
+
+```rust
+// OLD SYSTEM: does not work anymore
+dsl! {
+    &mut cmds.spawn_empty(),
+    Root(row screen_root main_margin(100.) distrib_start align_start image(&bg)) {
+        Menu(rules(px(310), pct(100)) main_margin(40.) image(&board) column) {
+            TitleCard(image(&title_card) width(pct(100)))
+            MiniTitleCard(ui(title_card) width(pct(50)))
+            // This will only create a single button
+            code(let cmds) {
+                for n in &menu_buttons {
+                    let name = format!("{n} button");
+                    dsl!(cmds, Entity(ui(*n) named(name) image(&button) height(px(33))));
+                }
+            }
+        }
+    }
+};
+```
+
+Now, the `cmds` passed to `code` is always an empty `EntityCommands`, you must
+do with it, there isn't really way to reproduce some of the old behaviors. Here
+is how I solved it for `simple_menu`:
+
+```rust
+dsl! {
+    &mut cmds.spawn_empty(),
+    Root(layout(">dSaS") screen_root main_margin(100.) image(&bg)) {
+        Menu(rules(px(310), pct(100)) main_margin(40.) image(&board) column) {
+            TitleCard(image(&title_card) width(pct(100)))
+            TitleCard2(ui(title_card) width(pct(50)))
+            code(let cmds) {
+                // Create a "Buttons" container and add the buttons as individual children
+                dsl!(cmds, Buttons(column height(child(2.)) width(pct(100))));
+                cmds.with_children(|cmds|{
+                    for n in &menu_buttons {
+                        let name = format!("{n} button");
+                        dsl!(
+                            // You'll notice this works the exact same way as the root invocation.
+                            &mut cmds.spawn_empty(),
+                            Entity(ui(*n) named(name) image(&button) height(px(33)))
+                        );
+                    }
+                });
+            }
+        }
+    }
+};
+```
+
 ## `cuicui_dsl`: Remove the `IntoEntityCommands` trait
 
 Now that dsl declarations MUST spawn a single entity, the `cmds` argument