add breaking changes doc #529

doc/source/handycontrol/breaking_changes/index.md

@@ -0,0 +1,10 @@
+---
+title: Breaking Changes
+---
+
+A breaking change is a change that may require you to make changes to your application in order to avoid disruption to your integration.
+
+## Version 3.0.0 
+
+- `TitleElement.TitleAlignment` Renamed to `TitleElement.TitlePlacement`
+- `TagPanel` Replaced by `TagContainer`

doc/themes/next/_config.yml

@@ -321,6 +321,8 @@ menu:
       MorphingAnimation 变形动画: /morphingAnimation/ ||
     国际化:
       default: /langs/ ||
+    Breaking Changes:
+      default: /breaking_changes/ ||
 
 # Enable / Disable menu icons / item badges.
 menu_settings: