added readme & cargo metadata

README.md

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+# Pixel Fight /rs
+
+![capture](./assets/capture.png)
+
+## Description
+
+A very simple zero-player fight simulator between groups of squares.
+
+## Usage
+
+```sh
+    USAGE:
+        pixel_fight <SUBCOMMAND>
+
+    OPTIONS:
+        -h, --help    Print help information
+
+    SUBCOMMANDS:
+        example    Dumps an example fight configuration to stdout
+        run        Runs a fight from a configuration file
+```
+
+## Installation
+
+can be installed with rustup/cargo:
+```sh
+cargo install pixel_fight
+```