feat(cpu): stub PSR Transfer instructions

src/cpu/psr_transfer.zig

@@ -0,0 +1,13 @@
+const std = @import("std");
+
+const Bus = @import("../Bus.zig");
+const Arm7tdmi = @import("../cpu.zig").Arm7tdmi;
+const InstrFn = @import("../cpu.zig").InstrFn;
+
+pub fn psrTransfer(comptime _: bool, comptime _: bool) InstrFn {
+    return struct {
+        fn inner(_: *Arm7tdmi, _: *Bus, _: u32) void {
+            std.debug.panic("[CPU] TODO: Implement PSR Transfer Instructions", .{});
+        }
+    }.inner;
+}