Added a way to use sdtool with rooted android phone

[HkHacker22]

Because Modern Laptops no longer comes with built-in card readers and usb card reader won't work, I developed a way to use rooted android phone to use sdtool.

[Copilot]

Pull request overview

Adds documentation for using sdtool on a rooted Android device via Termux as an alternative workflow when built-in card readers aren’t available on laptops.

Changes:

• Adds an Android (root-required) usage section to the main README linking to a dedicated guide.
• Introduces ANDROID.md with a step-by-step Termux workflow for checking/unlocking (temporary) write protection and optionally formatting the card.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
README.md	Adds a new Android usage section and link to the Android guide.
ANDROID.md	New, detailed rooted-Android/Termux guide for running sdtool against /dev/block/mmcblk* devices.

Comments suppressed due to low confidence (3)

ANDROID.md:60

• Device selection guidance is risky: on many devices mmcblk0 is internal storage, and running the later parted rm/mklabel commands on it could wipe the phone. The guide should explicitly warn against guessing the device name and recommend verifying it's the removable SD card.

**Important:** Look for a device named `mmcblk0` or `mmcblk1` with a size matching your SD card. (It may be found 5-10 lines from bottom).

ANDROID.md:75

• The example label "locked BYJU'S card" is brand-specific and not necessary for understanding the output. A generic description keeps the guide neutral and broadly applicable.

Expected output for a locked BYJU'S card:

ANDROID.md:28

• The guide uses sudo apt update before ensuring sudo is installed, so the first step can fail on a fresh Termux install. Termux package installs typically don't require sudo (use pkg/apt directly), and reserve sudo for block-device operations later in the guide.

Open Termux and update the package list:

```bash
sudo apt update && sudo apt upgrade

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