Create Malloy Fiddle app and config

[RandomFractals]

• Use malloy models form the Composer app created in #33
• Malloy Fiddle repo: https://github.com/malloydata/malloy-demo-fiddle
• Fiddle app config example: https://github.com/malloydata/malloy-demo-fiddle/blob/main/docs/samples.json

[RandomFractals]

Created 2022 Chicago Crime reports Malloy Fiddle app demo gif:

[RandomFractals]

see new With Malloy Fiddle section in docs: https://github.com/RandomFractals/chicago-crimes#with-malloy-fiddle