Add example project

[mikefowler]

Overview

Adds an example project that illustrates how to set up graphql-sequelize and dataloader-sequelize with graphql-yoga.

Closes https://github.com/mickhansen/graphql-sequelize/issues/610

Reviewers

to: @mickhansen @intellix cc: @MauriceMahan

[codecov-io]

Codecov Report

Merging #620 into master will not change coverage. The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #620   +/-   ##
======================================
  Coverage    91.7%   91.7%           
======================================
  Files          13      13           
  Lines         410     410           
======================================
  Hits          376     376           
  Misses         34      34

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[mmdevcodes]

Very helpful, thanks.

[mikefowler]

@mickhansen ah, thanks for the clarifications. I amended the commit.

[mikefowler]

@mickhansen this has been updated again, though it seems like the Travis suite is failing on some specs that should not have been affected by this change.

[mickhansen]

@mikefowler there are some intermittent errors but in any case i'd ignore them for the example :)