Create a Setup.swift file when running the init command

[pepicrft]

Short description 📝

Create a Setup.swift file when running the tuist init command. The Setup.swift doesn't contain any up command is intended to work as a reference for developers to know that it exists and how they can use it.

Solution 📦

• Add a new private method to the init command that generates the file.
• Add tests.

[tuistbot]

	1 Warning
⚠️	Have you introduced any user-facing changes? If so, please take some time to update the documentation. Keeping the documentation up to date makes it easier for users to learn how to use Tuist.

Generated by 🚫 Danger

[codecov]

Codecov Report

Merging #283 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #283      +/-   ##
==========================================
+ Coverage   87.96%   87.97%   +<.01%     
==========================================
  Files         265      262       -3     
  Lines        9405     9319      -86     
==========================================
- Hits         8273     8198      -75     
+ Misses       1132     1121      -11

Impacted Files	Coverage Δ
...ests/TuistKitTests/Commands/InitCommandTests.swift	100% <100%> (ø)	⬆️
Sources/TuistKit/Commands/InitCommand.swift	96.24% <100%> (+0.14%)	⬆️
Sources/TuistCoreTesting/Utils/MockSystem.swift	69.44% <0%> (-5.56%)	⬇️
Sources/ProjectDescription/Up/UpCustom.swift
...s/TuistKitTests/Models/Up/UpHomebrewTapTests.swift
Sources/TuistKit/Models/Up/UpHomebrewTap.swift
...ests/TuistKitTests/Models/Up/UpHomebrewTests.swift
Sources/TuistKit/Models/Up/UpHomebrew.swift
Tests/TuistKitTests/Models/Up/UpCustomTests.swift
Sources/ProjectDescription/Up/UpCarthage.swift
... and 20 more

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[ollieatkinson]

🦉

[ollieatkinson]

Maybe we should add a few examples but commented out.

This example when commented out wont compile will it?