Added README.md

README.md

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+### Generating an iPod Touch 2G NAND Image (for QEMU-iOS)
+
+This README contains the instructions on how to generate the NAND image for the iPod Touch 2G that can be read by [QEMU-iOS](https://github.com/devos50/qemu-ios).
+For this, you must put the `filesystem-it2g-readonly.img` file of the filesystem that will be included in the NAND image in the root of this repository.
+
+First, compile the binary with the following command:
+
+```
+gcc generate_nand.c -o generate_nand
+```
+
+Before generating the NAND image, make sure to remove any prior NAND data by running `rm -rf nand`.
+Then, generate your NAND image by running the compiled binary:
+
+```
+./generate_nand
+```