feat: workflow and config templates

[ameynert]

• Populates the config.yml, config_schema.yml, and Snakefile with "hello world" type examples.
• Adds a "Development" section to the template repo README.md
• Fleshes out the cookecutter README.md with examples of how to document inputs and outputs, and how to configure and run the workflow

[msto]

This is looking really nice! The new docs and schemas are awesome

[ameynert]

https://github.com/fulcrumgenomics/tertiary-analysis-template/pull/16

[clintval]

I'm wondering if the example README and actual example config should be aligned or if I'm missing something with the examples used and how they relate to each other.