docs: added-project-documentation-using-terraform-docs

[freaky4wrld]

Fixes: #57

Changes made

Added documentation to terraform projects in the terraform-incubator directory, the documentation is provided using terraform-docs.

Questions

• Do we have to produce documentation to terraform-incubator/people-depot/dev directory also as it is a sub-directory, but it is not mentioned in the issue ?
• Should the path variable under recursive section be path: modules or path: terraform-incubator, as terraform-incubator is the top level directory ?

[chelseybeck]

This looks great! Thanks @freaky4wrld