Add App git-sync

apps/git-sync/README_en.md

@@ -0,0 +1,51 @@
+# Git-Sync
+
+Git-Sync is a cross-platform tool for automatic synchronization and backup of Git repositories. It supports cron jobs, easy Docker deployment, and is suitable for both personal and team code backup.
+
+## Main Features
+
+- **Multi-repo sync**: Sync multiple Git repositories, auto pull and push.
+- **Cron jobs**: Built-in cron support for scheduled sync.
+- **Backup management**: Backup repositories to a specified local directory.
+- **Flexible config**: Custom config file path, backup directory, user permissions.
+- **Docker deployment**: One-click deployment, isolated environment, easy management.
+
+## Quick Deployment (Docker Example)
+
+```yaml
+version: "3"
+services:
+  git-sync:
+    image: akashrajpuroh1t/git-sync:latest
+    container_name: git-sync
+    environment:
+      - PUID=1000
+      - PGID=1000
+    volumes:
+      - /your/config.yaml:/git-sync/config.yaml
+      - /your/backup:/backups
+    restart: unless-stopped
+```
+
+> It is recommended to mount config.yaml and backup directory to the host for persistence and management.
+
+## Variable Description
+
+- **GITSYNC_CONFIG_PATH**: Config file path (e.g. /git-sync/config.yaml).
+- **GITSYNC_BACKUP_PATH**: Backup directory (e.g. /backups).
+- **PUID/PGID**: User and group ID inside the container (should match host, usually 1000).
+
+## FAQ
+
+- **Q: How to schedule sync?**
+  A: Configure cron rules in config.yaml, the container will sync automatically.
+- **Q: How to write the config file?**
+  A: See [official docs](https://github.com/AkashRajpurohit/git-sync/wiki/Installation#with-docker).
+- **Q: Which platforms are supported?**
+  A: Docker, Linux, Windows, etc.
+
+
+## Official Docs & Support
+
+- GitHub: https://github.com/AkashRajpurohit/git-sync
+- Install Guide: https://github.com/AkashRajpurohit/git-sync/wiki/Installation#with-docker