a basic readme

README.md

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+# TF Demo Parser
+
+Parsing of tf2 demo files
+
+## Building
+
+This project is build using rust and requires `cargo` and friends, see [the rust website](https://www.rust-lang.org/)
+for how to get started.
+
+Once rust is setup building is as simple as
+
+```bash
+cargo build --release
+```
+
+which will place the binary at `target/release/parse_demo`
+
+## Usage
+
+Basic usage is as simple as `parse_demo demofile.dem` which will output a "summary" of the demo file in JSON format.