setup basic file structure

abi/src/lib.rs

@@ -0,0 +1,9 @@
+#![no_std]
+
+use core::ffi::c_void;
+use shared::keyboard::{KeyCode, KeyEvent, KeyState, Modifiers};
+
+#[repr(C)]
+pub enum Syscall {
+    DrawPixels { x: u32, y: u32, color: u32 },
+}