Add the second assignment

[refs #b98bd825a820]

Author: jfahrer

persisting_data/assignment2.md

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+## Mounting volumes
+### Mount a volume containing files
+* Create a named volume test-data
+* Start a sh in a container running alpine
+  * Mount the volume test-data to /data
+* Create some files and folders in the volume
+  * `touch /data/test.file`
+  * `mkdir /data/some_dir`
+* Stop the container running alpine
+* Start bash shell a container running your nginx image
+  * Mount the volume test-data to /var/www/html
+* What can you find in the directory /var/www/html?
+
+### Mount a new volume
+* Start bash shell in a container running your nginx image
+  * Mount a new named or anonymous volume to /var/www/html
+* What can you find in the directory /var/www/html?