uploaded example using JWT and Rusqlite for authentication

[Stipulations]

uploaded example using JWT and Rusqlite for authentication

[robjtede]

if you're interested in this being accepted still, can you please:

• move it into the auth/ dir
• give it a shorter name
• add a readme (see other examples) with instructions for usage etc.
• instead of a premade DB file, add a .sql file with instructions in the README on how to create a users.db file locally
• .gitignore the users.db file location