Add example for @ngrx/store

[igor-dv]

Issue: Angular people are using https://github.com/ngrx a lot. I think it is nice to have a dedicated section in examples with issues regarding the ngrx.

What I did

Added an example for @ngrx/store. CC #3217

[codecov]

Codecov Report

Merging #3233 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3233   +/-   ##
=======================================
  Coverage   35.95%   35.95%           
=======================================
  Files         437      437           
  Lines        9473     9473           
  Branches      874      890   +16     
=======================================
  Hits         3406     3406           
+ Misses       5514     5508    -6     
- Partials      553      559    +6

Impacted Files	Coverage Δ
app/polymer/src/server/utils.js	0% <0%> (-100%)	⬇️
lib/ui/src/modules/ui/components/shortcuts_help.js	12.85% <0%> (ø)	⬆️
lib/ui/src/libs/withLifecycleDecorator.js	17.14% <0%> (ø)	⬆️
addons/actions/src/lib/util/typeReplacer.js	54.54% <0%> (ø)	⬆️
addons/a11y/src/components/WrapStory.js	61.11% <0%> (ø)	⬆️
addons/info/src/components/PropVal.js	84.25% <0%> (ø)	⬆️
addons/knobs/src/components/types/Color.js	8.1% <0%> (ø)	⬆️
lib/core/src/client/preview/story_store.js	84.21% <0%> (ø)	⬆️
addons/info/src/components/types/OneOfType.js	60% <0%> (ø)	⬆️
addons/graphql/src/components/FullScreen/index.js	0% <0%> (ø)	⬆️
... and 60 more

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[Hypnosphi]

@tmeasday it's happening again: screenshots are lost
https://www.chromaticqa.com/build?appId=5a375b97f4b14f0020b0cda3&number=1507

[tmeasday]

@Hypnosphi thanks! I'm pretty sure this is due to a bug that we have fixed and will be releasing soon after a little more testing.