[TheRealAshik]

Summary

• Add developer-focused project overview, verified feature list, and package architecture map.
• Document Android Studio and Gradle debug builds, Gemini/Firebase/Jules configuration, and common setup troubleshooting.
• Link the existing CI workflow and official Android, Firebase, Gemini, and Jules references.
• Include secret-handling guidance and a factual note that no root license file was found.

Verification

• Confirmed README is the only changed file against main.
• Checked Markdown code fences and verified the branch contains exactly one task commit relative to main.
• Reviewed documented paths and commands against repository configuration.
• Runtime build not run; this change only adds documentation.