[shinobi] Add Shinobi chart

[giannoug]

Description of the change

Added new chart for Shinobi, the open source CCTV solution.

Benefits

Easily install and manage Shinobi installations.

Possible drawbacks

1. Image tag doesn't contain a tagged version. They seem to use dev on their Docker installation script.
2. The Docker image contains a built-in MySQL instance, checking how to disable this.

Applicable issues

• fixes #1597

Additional information

Checklist

• [X] Title of the PR starts with chart name (e.g. [home-assistant])
• [X] Variables have been documented in the values.yaml file.