chore(docs): add AppYourself reference customer

[dreamorosi]

Description of your changes

This PR adds a new reference customer to the README files and docs for the project.

AppYourself provides a platform that allows customers to easily create and publish apps that boost their business. They have kindly opted-in to support Powertools by becoming a public reference.

Related issues, RFCs

Issue number: closes #1820

Checklist

• My changes meet the tenets criteria
• I have performed a self-review of my own code
• I have commented my code where necessary, particularly in areas that should be flagged with a TODO, or hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my change is effective and works
• The PR title follows the conventional commit semantics

Breaking change checklist

Is it a breaking change?: NO

• I have documented the migration process
• I have added, implemented necessary warnings (if it can live side by side)

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[sonarqubecloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud