`{graphql-js-introspection}`: Add docs of generating the graphql-js query & result files.

[chris-ramon]

Actual

Currently we don't have docs about updating the following files:

• query.graphql.
• query-result.json.

Expected

We want to add docs to it because it is required by the library for doing the comparison of introspection result.

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[chris-ramon]

Getting Up & Running

Install node modules:

npm i

Generate the introspection query:

npm run start

TODOs:

• Create a new node command: npm run generate-query-introspection, which saves the introspection result to the query.graphql file, but it should be better to rename to introspection-query.graphql.
• Create a new node command: npm run execute-query-introspection, which executes the introspection-query.graphql then save the result to a file named: introspection-query-result.json.