Added x86 package

src/x86/Return.go

@@ -0,0 +1,7 @@
+package x86
+
+// Return transfers program control to a return address located on the top of the stack.
+// The address is usually placed on the stack by a Call instruction.
+func Return(code []byte) []byte {
+	return append(code, 0xC3)
+}