Add Keyboard app documentation

[mirmibrahimjakhro62-prog]

Sindhi keyboard app

Description

Provide a concise summary of the changes made in this pull request

Pull request type

Check the appropriate box:

• Review Fixes
• Documentation Overhaul
• Feature/Story
  • Link one or more Engineering Tickets
    *
• A-Force
• Error in documentation
• Maintenance

Documentation tickets

Link to one or more documentation tickets:

Checklist

From the below options, select the ones that are applicable:

• Checked for Grammarly suggestions.
• Adhered to the writing checklist.
• Adhered to the media checklist.
• Verified and updated cross-references or added redirect rules.
• Tested the redirect rules on deploy preview.
• Validated the modifications made to the content on the deploy preview.
• Validated the CSS modifications on different screen sizes.

[vercel]

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[CLAassistant]

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[mirmibrahimjakhro62-prog]

Sindhi keyboard app