Added a basic README

README.md

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+Rust Bare-Bones Kernel
+=====
+
+This is designed to be a rust equivalent of the OSDev.org Bare\_Bones article, presenting the bare minimum you need to get started.
+
+Features
+---
+* x86 and x86\_64 (amd64) "ports"
+* Initial paging for both (with higher-half)
+* Serial output using the classic PC serial port, passing through the rust `::core::fmt` interface
+* Links with libcore
+
+
+Requirements
+---
+* A recent (1.0alpha) build of rustc
+* A suitable cross-compiling copy of binutils (i586-elf or x86\_64-elf)
+* A copy of the libcore source in .../libcore (synlink will do)
+