Create README.md

Author: rainemak

README.md

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+# The Rust Programming Language
+
+This is [Sailfish OS] source code repository for [Rust]. It contains the
+compiler, standard library, and documentation.
+
+[Sailfish OS]: https://sailfishos.org
+[Rust]: https://www.rust-lang.org
+
+## Quick Start
+
+Read ["Installation"] from [The Book].
+
+["Installation"]: https://doc.rust-lang.org/book/ch01-01-installation.html
+[The Book]: https://doc.rust-lang.org/book/index.html
+