Set up android integration documentation

[VictorKabata]

Description

• Set up MkDoc-Material documentation for android/kotlin integration

Issue

N/A

Screenshots / GIFs

N/A

Checklist

• I have run the gradle command: ./gradlew clean build
• I have added or updated relevant tests.
• I have updated the documentation.
• I have ensured code style consistency by running the gradle command: ./gradlew :daraja:ktlintCheck :daraja:detekt .
• I have addressed any potential compatibility issues.
• I have considered backward compatibility.

Additional Notes

• More documentation work is pending for the iOS/swift sample