Tutorials graphql typescript sdk

[anilkk]

Summary

This PR contains 3 tutorials using GrpahQL and TypeScript SDK.

• Getting started with GraphQL and TypeScript SDK to retrieve project settings.
• Create a new customer using GraphQL mutation and TypeScript SDK.
• How to use where clause with GraphQL query using TypeScript SDK.

[codecov]

Codecov Report

Merging #1683 (129add4) into master (fbd673d) will not change coverage.
The diff coverage is n/a.

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  Hits         3339     3339           
  Misses         42       42           
  Partials        4        4           

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[stmeissner]

LGTM 👍