License and readme

README.md

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+# Rust Kroz
+
+[![Build Status](https://drone.valter.cat/api/badges/valter/kroz-rs/status.svg)](https://drone.valter.cat/valter/kroz-rs)
+
+This is an **UNOFFICIAL** attempt to rewrite (in Rust) the late 80s/early 90s text-mode action game series Kroz by Apogee Software founder Scott Miller.
+
+The goal is to closely mimic the look and behavior of the original game, but not necessarily recreate it exactly. I plan on making the following changes to make it generally more accessible:
+
+- Remove all the references to ordering/registration
+  - [The original game is free and open source now](http://legacy.3drealms.com/news/2009/03/several_old_games_released_as_freeware.html)
+- Combine every episode into one executable
+- Enable returning to the main menu from the game
+- Load custom levels/campaigns from external files
+  - A built-in level editor would be nice
+- Load custom tile graphics from an external file
+- Settings for things like sound volume and controls
+- Game speed will be fixed, possibly configurable
+  - The original game's speed varied with CPU speed
+- Improve control response
+- Support Windows, Linux, macOS
+  - Possibly web and mobile platforms too
+
+## Building
+
+1. [Install Rust](https://rustup.rs/)
+2. Run `cargo build` or `cargo run`
+
+## License
+
+"Kroz" is a registered trademark of Apogee Software, Ltd.  
+The original "Kroz" copyright 1987 - 2009 Apogee Software, Ltd. All trademarks and copyrights reserved.
+
+This project has no affiliation with Apogee Software, Ltd and its code is licensed under the [GNU General Public License Version 3](https://www.gnu.org/licenses/gpl-3.0.en.html).