Implemented register to register instructions

src/build/asm/RegisterRegister.go

@@ -0,0 +1,18 @@
+package asm
+
+import (
+	"fmt"
+
+	"git.akyoto.dev/cli/q/src/build/cpu"
+)
+
+// RegisterRegister operates with two registers.
+type RegisterRegister struct {
+	Destination cpu.Register
+	Source      cpu.Register
+}
+
+// String returns a human readable version.
+func (data *RegisterRegister) String() string {
+	return fmt.Sprintf("%s, %s", data.Destination, data.Source)
+}