Create README.md

README.md

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+# nel_os
+
+## Required Tools
+
+- rustup
+- cargo
+- qemu-system-x86_64
+
+## Build Requirements
+
+```sh
+rustup default nightly
+rustup component add rust-src --toolchain nightly-x86_64-unknown-linux-gnu
+rustup component add llvm-tools-preview
+cargo install bootimage
+```
+
+## Running
+
+```sh
+cargo run --release
+```