Create README.md

Author: phil-opp

README.md

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+# rustboot-x86
+An experimental pure-Rust x86 bootloader for the [planned second edition](https://github.com/phil-opp/blog_os/issues/360) of the [Writing an OS in Rust](https://os.phil-opp.com) series.
+
+**This is still work in progress**.
+
+## Build and Run
+You need a nightly [Rust](https://www.rust-lang.org) compiler, [xargo](https://github.com/japaric/xargo), [objcopy](https://sourceware.org/binutils/docs/binutils/objcopy.html) (or a similar tool), and [QEMU](https://www.qemu.org/) (for running it).
+
+```
+> RUST_TARGET_PATH=(pwd) xargo build --target test
+> objcopy -O binary -S target/test/debug/elf_loader test-bin
+> qemu-system-x86_64 -hda test-bin -d int -s
+```