Update README.md

src/docker/Dockerfile

@@ -33,4 +33,5 @@ RUN ln -s /usr/local/bin/mysql_bkup.sh /usr/local/bin/mysql_bkup
 RUN ln -s /usr/local/bin/mysql_bkup.sh /usr/local/bin/bkup
 
 RUN mkdir /backup
-WORKDIR /backup
+WORKDIR /backup
+VOLUME /backup

src/mysql_bkup.sh

@@ -1,4 +1,11 @@
-#!/usr/bin/env bash 
+#!/usr/bin/env bash
+
+# MySQL Backup & Restore 
+
+# @author    Jonas Kaninda
+# @license   MIT License <https://opensource.org/licenses/MIT>
+# @link      https://github.com/jkaninda/mysql-bkup
+#
 set -e
 TIME=$(date +%Y%m%d_%H%M%S)
 MY_SQL_DUMP=/usr/bin/mysqldump