Added SETTING_UP_A_DEV_ENVIRONMENT.md for version 3.3.0-alpha.0

[dangreenisrael]

This is the 3.3 version of this PR: #1856

What I did

I created a walkthrough for setting up a dev environment with a demo project

Why I did it

It took me a while to get my dev environment set up, so I thought I would codify the steps needed to do it.

Notes

This version was tested against @storybook/cli@v3.3.0-alpha.0

[codecov]

Codecov Report

Merging #1864 into release/3.3 will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           release/3.3    #1864   +/-   ##
============================================
  Coverage        22.26%   22.26%           
============================================
  Files              324      324           
  Lines             6337     6337           
  Branches           812      814    +2     
============================================
  Hits              1411     1411           
+ Misses            4309     4306    -3     
- Partials           617      620    +3

Impacted Files	Coverage Δ
...codemod/src/transforms/update-organisation-name.js	40.62% <0%> (ø)	⬆️
lib/components/src/highlight_button.js	0% <0%> (ø)	⬆️
addons/viewport/src/components/RotateViewport.js	22.72% <0%> (ø)	⬆️
lib/ui/src/modules/ui/libs/hierarchy.js	50.74% <0%> (ø)	⬆️
addons/storyshots/src/test-bodies.js	19.14% <0%> (ø)	⬆️
addons/knobs/src/KnobStore.js	6.81% <0%> (ø)	⬆️
addons/knobs/src/components/PropForm.js	8.51% <0%> (ø)	⬆️
lib/ui/src/modules/ui/routes.js	0% <0%> (ø)	⬆️
addons/storyshots/src/require_context.js	45.58% <0%> (ø)	⬆️
addons/info/src/components/PropTable.js	22.22% <0%> (ø)	⬆️
... and 21 more

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[Hypnosphi]

This file partly duplicates CONTRIBUTING.md. Can we have just one?

[dangreenisrael]

@Hypnosphi I can consolidate them tonight

[dangreenisrael]

@Hypnosphi After going over the 3.3 version of CONTRIBUTING.md in more depth, I think that this is fairly redundant. I originally wrote it after having a hard time with the docs in master, as I didn't know about 3.3. I'm going to close this for now, but if you think there is some value in this I can always re-open it at a later time. Cheers.