Improve the NimbleTemplate docs

[byhbt]

Why

As the NimbleTemplate is a public package and we published it on Hex. Therefore it's good to have some documentation on the https://hexdocs.pm/nimble_template/NimbleTemplate.ProjectHelper.html

• Add content to the Summary section of each Module:
  • [ ] NimbleTemplate.AddonHelper
  • [ ] NimbleTemplate.CredoHelper
  • [ ] NimbleTemplate.DependencyHelper
  • [ ] NimbleTemplate.GithubHelper
  • [ ] NimbleTemplate.ProjectHelper

Who Benefits?

Contributors