Create endpoint for listing notes of a single user

[DrStrangeloovee]

To list the available notes of the currently signed in user an endpoint is needed which should return the needed data. The needed data is probably:

• ID which can then be used to access the contents of the actual note to load
• Metadata: creation & last edited date

See #41 for further information.

[DrStrangeloovee]

Implemented with c7bc7d5c9cd723ef4d6a92a827749b3e5a88c685