docs: add readability statement

[sebastienlevert]

Closes #99

Adds the readability statement on the generated code.

[learn-build-service-prod[bot]]

Learn Build status updates of commit 1e6b52f:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
OpenAPI/kiota/experience.md	:white_check_mark:Succeeded

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[learn-build-service-prod[bot]]

Learn Build status updates of commit 156119e:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
OpenAPI/kiota/experience.md	:white_check_mark:Succeeded

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel