Simple FAT16/32 driver implementation

README.md

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+# Setup
+- Install `qemu-system-x86_64`, `gdisk`
+- Install `cargo` (using [rustup](https://rustup.rs/) is the preferred cross-platform way to get Rust set up on your machine)
+- We also require `OVMF_CODE.fd` and `OVMF_VARS.fd` in the root directory to boot QEMU in UEFI mode. These files are omitted due to potential licensing issues (read: I haven't properly looked into it yet). 
+- For creating a test disk image automatically, we require `mkfs.fat` and `mkfs.ext4` to be available.
+# Running
+Simply run `./run.sh` in the root directory to take care of setting up the environment and running QEMU with the required options.