Adding Contact lists with telephone numbers via Markdown

EventR supports markdown in additional information and description fields. This allows you to create links, tables and formatting in the tables. A link type we support is "tel:". Typing telephone number into these fields can then be done using the text:

[John Smith](tel:0123456789)

Makes the a link like [Smith] appear in the text. You can make tables also using a format like:

| Syntax      | Description |
| ----------- | ----------- |
| Header      | Title       |
| Paragraph   | Text        |

We also support picture and video links, but please note these do not get downloaded for offline use, so may not display if you have no coverage.