Add readme

Author: Tristramg

readme.md

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+# osm4routing2
+
+This project is a rewrite in rust from https://github.com/Tristramg/osm4routing
+
+It converts an OpenStreetMap file (in the `.pbf` format) into a CSV file.
+
+## Build
+Get a rust distribution with `cargo`: https://www.rust-lang.org/en-US/downloads.html
+
+Run `cargo build`