docs: add customer options guide

Author: SayanthRock

docs/CUSTOMER_OPTIONS.md

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+# Customer Options
+
+The project should present every customer feature with a clear status.
+
+## Status labels
+
+- Safe: works with normal Android APIs or simple guidance.
+- Test required: may work only on specific OPPO, OnePlus, or realme firmware.
+- Root required: needs Magisk, KernelSU, or APatch.
+- Experimental: not for stable customer release yet.
+- Not supported: do not offer this option on that device.
+
+## Customer menu
+
+| Option | Status | Notes |
+|---|---|---|
+| Home screen wallpaper | Safe | Use normal wallpaper settings or companion app later |
+| Lock screen wallpaper | Safe on supported devices | Some OEM builds restrict this |
+| Theme folder package | Test required | Needs real device testing |
+| About phone dashboard | Safe | Read-only device information |
+| Performance help | Safe | Tips and diagnostics only |
+| LSPosed mode | Experimental | Root and framework required |
+| Support report | Safe | Helps collect model and issue details |
+| Rollback help | Required | Every customer release needs uninstall steps |
+
+## Customer promise
+
+Do not promise that one APK or ZIP can solve every phone automatically. Promise clear options, safe setup, tested device support, and fast rollback help.