Adds render file

[umaar]

Type: feature

The following has been addressed in the PR:

• [x] There is a related issue https://github.com/dojo/cli-create-theme/issues/2
• [x] All code matches the style guide
• [x] Unit or Functional tests are included in the PR

Description:

This PR migrates the renderFiles implementation from another repo, into this repository which means other external CLI commands can benefit from it.

Once it has been merged, we can remove https://github.com/dojo/cli-create-app/blob/master/src/renderFiles.ts and make that repo use this implementation., issue to do this: https://github.com/dojo/cli-create-app/issues/127 also https://github.com/dojo/cli-create-widget/issues/6

Should also merge: https://github.com/dojo/interfaces/pull/86

[codecov[bot]]

Codecov Report

Merging #180 into master will decrease coverage by 0.87%. The diff coverage is 81.81%.

@@            Coverage Diff             @@
##           master     #180      +/-   ##
==========================================
- Coverage    97.9%   97.02%   -0.88%     
==========================================
  Files          16       17       +1     
  Lines         382      404      +22     
  Branches       49       51       +2     
==========================================
+ Hits          374      392      +18     
- Misses          3        5       +2     
- Partials        5        7       +2

Impacted Files	Coverage Δ
src/CommandHelper.ts	100% <100%> (ø)	:arrow_up:
src/template.ts	78.94% <78.94%> (ø)

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[umaar]

Thanks @rorticus ! Could you also check the interfaces pull request too: https://github.com/dojo/interfaces/pull/86 (just so I can merge them at the same time)

[umaar]

Thanks @tomdye do you mind approving https://github.com/dojo/interfaces/pull/86 too because I think we need to merge that and this at the same time

I have made issues for both those repos and linked to them in the description of this PR