Updated README.

README.md

@@ -1,2 +1,12 @@
 # docker-seafile-client
 Run a seafile client inside docker witch can sync files from seafile repositories
+
+See docker-compose how to use.
+
+## environment variables:
+ - LIBRARY_ID=<your-library-id-here>   Can be multiple library ids seperated with colon :
+ - SERVER_URL=<server-url>             The url used to access your server, eg: https://example.seafile.com
+ - SERVER_PORT=<server-port>           Which port the server is hosted on: usually 443 (https) or 80 (http)
+ - USERNAME=<username>                 Your account username (credentials)
+ - PASSWORD=<password>                 Your account password (credentials)
+ - DATA_DIR=<directory-path-to-sync>   The path where to put the files