Update README with file context menu feature

Author: whtiehack

README.md

@@ -12,6 +12,7 @@ An Obsidian plugin that automatically commits vault changes to git.
 - **Auto Push**: Optionally push to remote after commit
 - **Manual Operations**: Commands for manual pull, commit, and push
 - **Ribbon Button**: Quick access menu for Git actions (pull, commit, push, revert)
+- **File Context Menu**: Right-click modified files to revert individual changes
 - **Conflict Detection**: Detect merge conflicts and pause auto-commit until resolved
 - **Git Status Badges**: Show colored dots next to modified/new files in file explorer
 - **Repository Management**: Initialize repo and configure remote URL from settings

README_zh.md

@@ -12,6 +12,7 @@
 - **自动推送**：可选在提交后自动推送到远程
 - **手动操作**：提供手动拉取、提交、推送命令
 - **侧边栏按钮**：快捷 Git 操作菜单（拉取、提交、推送、还原）
+- **文件右键菜单**：右键已修改文件可还原单个文件
 - **冲突检测**：检测合并冲突并暂停自动提交直到解决
 - **Git 状态徽章**：在文件浏览器中显示文件状态彩色圆点
 - **仓库管理**：在设置中初始化仓库和配置远程地址