chore: add ZigGBA

Also get a ZigGBA implementation of first.gba working

src/first.zig

@@ -0,0 +1,18 @@
+const GBA = @import("gba").GBA;
+const Mode3 = @import("gba").Mode3;
+const LCD = @import("gba").LCD;
+
+export var gameHeader linksection(".gbaheader") = GBA.Header.setup("FIRST", "AFSE", "00", 0);
+
+pub fn main() noreturn {
+    LCD.setupDisplayControl(.{
+        .mode = .Mode3,
+        .backgroundLayer2 = .Show,
+    });
+
+    Mode3.setPixel(120, 80, GBA.toNativeColor(31, 0, 0));
+    Mode3.setPixel(136, 80, GBA.toNativeColor(0, 31, 0));
+    Mode3.setPixel(120, 96, GBA.toNativeColor(0, 0, 31));
+
+    while (true) {}
+}

src/main.zig

@@ -1,9 +0,0 @@
-const std = @import("std");
-
-pub fn main() anyerror!void {
-    std.log.info("All your codebase are belong to us.", .{});
-}
-
-test "basic test" {
-    try std.testing.expectEqual(10, 3 + 7);
-}