Create a DoCM tutorial

[malachig]

We should create a DoCM tutorial. This could live on a new page of the DoCM site (e.g. help or getting started).

This tutorial could include things like:

• Query using DoCM website to get all variants for a specific disease, all variants for a specific gene, all variants for a region of the genome.
• Export results of a query to a VCF file or TSV file
• Use the API to perform the same queries. Provide an example script that does this. To lower the bar for a broad variety of users, provide examples written in Perl, Python and Ruby.