README.md: Add an important message for v1 -> v2

Author: xor-gate

README.md

@@ -1,8 +1,12 @@
 # Syncthing for macOS
 
+```markdown
+> [!IMPORTANT]
+> `develop` uses since 18 januari Syncthing `v2`. If you are looking for `v1` release see the respective source branch. Syncthing `v1` is marked as deprecated and `v2` upgrades are automatically pushed when enabled. All users are expected to upgrade. 
+```
+
 [![Syncthing forum](https://img.shields.io/badge/syncthing-%20forum-blue.svg)](https://forum.syncthing.net/t/syncthing-for-macos)
 [![Downloads](https://img.shields.io/github/downloads/syncthing/syncthing-macos/total.svg)](https://github.com/syncthing/syncthing-macos/releases) [![Latest release](https://img.shields.io/github/release/syncthing/syncthing-macos.svg)](https://github.com/syncthing/syncthing-macos/releases/latest) [![license](https://img.shields.io/github/license/mashape/apistatus.svg?maxAge=2592000)](LICENSE)
-
 # Introduction
 
 `syncthing-macos` project is a [frugal](https://en.wikipedia.org/wiki/Frugality) [native](https://en.wikipedia.org/wiki/Native_(computing)) macOS [Syncthing](https://syncthing.net) tray application bundle. It bundles its own Syncthing instance and wraps Syncthing background process, making it behave more like a native macOS application and less like a command-line utility with a web browser interface.