[DOCS] Added reference to Extend Config Data for the Store GraphQl …

[lewisvoncken]

…endpoint

Purpose of this pull request

This pull request (PR) adds a reference to add your own configuration to the Store GraphQl endpoint by using the extendConfigData array within the construct of the StoreConfigDataProvider

Added the following content:

Affected DevDocs pages

• https://devdocs.magento.com/guides/v2.3/graphql/reference/store-config.html

Links to Magento source code

• https://github.com/magento/magento2/blob/2.3-develop/app/code/Magento/StoreGraphQl/Model/Resolver/Store/StoreConfigDataProvider.php#L50

Mage2gen example module

• https://mage2gen.com/load/a72e1739-76b1-469c-a33d-8ef39a5b9bed?main_version=3

whatsnew
Described how to add custom store configuration attributes to the storeConfig query.

[devops-devdocs]

An admin must run tests on this PR before it can be merged.

[ronak2ram]

Hi @lewisvoncken
Thanks for your contribution.
Can you please update suggested changes.

[lewisvoncken]

@ronak2ram I have just updated according to the suggested change.

[keharper]

This is some great information. I'd like to expand it a bit and create a new topic. It could have a title like "Extend a query or mutation with custom attributes" and be placed in the graphql/develop directory. The topic could have the following contents:

1. An introductory paragraph or two that describes the task.
2. A section that describes the custom fields.
3. A section about updating the di.xml file.
4. A section about the custom module's schema.graphqls file.
5. An example query containing the custom attribute and results.

3 & 4 are mostly done, and 5 would be easy. I don't know how much work it would take to describe what you had to do to create these custom fields.

As with any new topic contributed by the community, your company would get full credit for the topic.

Let me know whether you'd be willing to do this.

Meanwhile, I've also posted some editorial corrections.

[lewisvoncken]

@keharper The requested changes have been applied and I am willing to do this but in my opinion it should be separated from this pr so I will make a new one soon.

[keharper]

@lewisvoncken One more small change.

[lewisvoncken]

@keharper
The small changes has been applied

[keharper]

running tests

[ghost]

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[keharper]

Thanks for your contribution, @lewisvoncken .