Create README.md

Author: BenWoodworth

README.md

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+## About
+This is a simple game engine that was built to run bare-metal on a Raspberry Pi 3.
+Using the Raspberry Pi's UART hardware, the games can be played through a serial terminal, and create colored text graphics with ANSI codes. 
+
+The engine was architected with platform-specific details (timer, terminal) abstracted out so it could also
+be implemented and compiled for desktop, which is easier to test and debug.
+The platform-specific dependencies are injected in [`main.c`](source/main.c) based on compiler flags.
+
+## Demo
+A menu and two games are included as examples, controlled using the WASD and Space keys.
+
+<details>
+  <summary><b>Menu</b> (Epilepsy warning: has cycling colors)</summary>
+  <img alt="Menu" src="images/game-menu.gif" />
+</details>
+
+<details>
+  <summary><b>Snake</b></summary>
+  <img alt="Snake" src="images/game-snake.gif" />
+</details>
+
+<details>
+  <summary><b>Tic-Tac-Toe</b></summary>
+  <img alt="Tic-Tac-Toe" src="images/game-tic-tac-toe.gif" />
+</details>
+
+## Design
+
+<details>
+  <summary>Architecture Diagram</summary>
+  <img alt="Architecture Diagram" src="images/diagram-architecture.png" />
+</details>
+
+<details>
+  <summary>Sequence Diagram</summary>
+  <img alt="Sequence Diagram" src="images/diagram-sequence.png" />
+</details>
+
+## Building
+
+Building can be done with `make raspi3`, or `make gcc` for desktop. Making raspi3 requires the Linaro arm-none-eabi-g++ cross compilation toolchain.