Define CPU registers

src/cpu.rs

@@ -0,0 +1,28 @@
+pub enum Register {
+    A(u8),
+    B(u8),
+    C(u8),
+    D(u8),
+    E(u8),
+    F(u8),
+    H(u8),
+    L(u8),
+    SP(u16),
+    PC(u16),
+}
+
+pub struct Registers {
+    a: Register,
+    b: Register,
+    c: Register,
+    d: Register,
+    e: Register,
+    f: Register,
+    h: Register,
+    sp: Register,
+    pc: Register,
+}
+
+pub struct CPU {
+    registers: Registers,
+}

src/lib.rs

@@ -0,0 +1 @@
+pub mod cpu;