doc: update README for git-lfs on Windows (#1881)

Signed-off-by: leo <longshuang@msn.cn>

Author: love-linger

README.md

@@ -88,6 +88,12 @@ For **Windows** users:
   ```
 * Pre-built binaries can be found in [Releases](https://github.com/sourcegit-scm/sourcegit/releases/latest)
 
+> [!NOTE]
+> `git-lfs` is no longer shipped with **Git for Windows** since `2.51.1`. You can use it by following these steps:
+>  * Download [git-flow-next](https://github.com/gittower/git-flow-next/releases)
+>  * Unzip & Rename the `git-flow-next` to `git-flow`
+>  * Copy to `$GIT_INSTALL_DIR/cmd` or just add its path to you `PATH` directly
+
 For **macOS** users:
 
 * Thanks [@ybeapps](https://github.com/ybeapps) for making `SourceGit` available on `Homebrew`. You can simply install it with following command: