docs(readme): add 'Breaking Changes' section (singerdmx#2275)

Author: EchoEllet

README.md

@@ -53,6 +53,7 @@ You can join our [Slack Group] for discussion.
 - [📦 Installation](#-installation)
 - [🛠 Platform Specific Configurations](#-platform-specific-configurations)
 - [🚀 Usage](#-usage)
+- [💥 Breaking Changes](#-breaking-changes)
 - [🔤 Input / Output](#-input--output)
 - [⚙️ Configurations](#️-configurations)
 - [📦 Embed Blocks](#-embed-blocks)
@@ -158,6 +159,23 @@ void dispose() {
 
 Check out [Sample Page] for more advanced usage.
 
+## 💥 Breaking Changes
+
+- APIs marked with [`@experimental`](https://api.flutter.dev/flutter/meta/experimental-constant.html) 
+are subject to change or removal at any time and should be used with caution, 
+as they may be altered even in minor versions.
+
+- APIs marked with [`@internal`](https://api.flutter.dev/flutter/meta/internal-constant.html)
+and [`@visibleForTesting`](https://api.flutter.dev/flutter/meta/visibleForTesting-constant.html) are not intended for
+public use and should be avoided entirely.
+
+- The `package:flutter_quill/flutter_quill_internal.dart` expose internal APIs
+to be used by other related packages and should be avoided when possible.
+
+We make every effort to ensure internal APIs are not exported by default. Use experimental features at your own discretion.
+
+We recommend checking the `CHANGELOG.md` or release notes for each update to stay informed.
+
 ## 🔤 Input / Output
 
 This library uses [Quill Delta](https://quilljs.com/docs/delta/)