Add README.md

Author: OverShifted

README.md

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+# Rust Software Rendering
+An experimental software renderer written in pure rust.
+
+![screenshot](https://github.com/OverShifted/RustSoftwareRendering/blob/master/screenshot.png?raw=true)
+
+To run:
+```sh
+git clone https://github.com/OverShifted/RustSoftwareRendering
+cd RustSoftwareRendering
+cargo run --release
+```
+
+Note: This project depends on [minifb](https://github.com/emoon/rust_minifb). So you might need to install [these libraries](https://github.com/emoon/rust_minifb#build-instructions) on Linux.