Add README for mariadb

bitnami/mariadb/README.md

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+# Bitnami MariaDB Docker Stack
+
+## Usage
+
+### Running a mysql server
+```
+docker run --name mysql-server \
+  -v /my-data:/data \
+  -v /my-conf:/conf \
+  -d bitnami/mariadb
+```
+
+### Running the mysql client
+```
+docker run --link mysql-server:mysql bitnami/mariadb \
+  sh -c 'exec mysql -h"$MYSQL_PORT_3306_TCP_ADDR" -P"$MYSQL_PORT_3306_TCP_PORT" \
+  -uroot -p"$MYSQL_ENV_MYSQL_ROOT_PASSWORD"'
+```
+
+## Persistence
+
+Map a volume on your host to `/data` to persist your database when the container is removed.
+
+If the volume is empty, the database will be initialized in your volume.
+
+## Configuration
+
+### Pass custom arguments/flags to mysqld
+
+For example, you can run the server on a different port by specifying the port option.
+
+```
+docker run --name mysql-server -d bitnami/mariadb --port=4000
+```
+
+### my.cnf
+
+Map a volume on your host to `/config` with your custom `my.cnf` inside it, to configure MariaDB.
+
+If the volume is empty, the default configuration will be copied to your volume.
+
+### MySQL root password
+
+To specify a custom password, you can pass the `MYSQL_PASSWORD` environment variable when run with
+an empty data volume. This will initialize the database with your chosen password.
+
+## Logging
+
+The container is set up to log to stdout, which means logs can be obtained as follows:
+```
+docker logs mysql-server
+```