Update README.md

README.md

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-# cron-backups
+# ⏱️📦 Cron Backups
+Cron backups is a docker image to automate periodic backups easily to Dropbox with only one Docker container! 
+
+## Features
+- Auto compression 
+- Periodic backups
+- Multiple folder selection
+- Tiny footprint (9Mb)
+- Upload to Dropbox
+
+## Usage
+You only need to set your backup folders and 2 environment variables.
+
+### Volumes
+It backups every folder you mapped into `/backup` folder with volumes
+
+### Environment Variables
+`CRON`: Crontab value to set period of backups. Ref: https://crontab.guru/
+
+`DROPBOX_TOKEN`: Access Token you get for Dropbox folder. Ref: https://www.dropbox.com/developers/apps/create
+
+### Example
+Edit docker-compose and run with `docker-compose up -d`
+```
+version: '3'
+services:
+  caddy:
+    image: yunussandikci/cron-backups
+    volumes:
+    - /Users/yunussandikci/Pictures/:/backup/Pictures  
+    - /Users/yunussandikci/Downloads/:/backup/Downloads
+    - /Users/yunussandikCci/Documents/Zoom/:/backup/Zoom
+    environment:
+      CRON: "* * * * *" 
+      DROPBOX_TOKEN: "<dropbox_token>"
+```