Implemented instruction lists

src/asm/Mnemonic.go

@@ -0,0 +1,21 @@
+package asm
+
+type Mnemonic uint8
+
+const (
+	NONE Mnemonic = iota
+	MOV
+	SYSCALL
+)
+
+func (m Mnemonic) String() string {
+	switch m {
+	case MOV:
+		return "mov"
+
+	case SYSCALL:
+		return "syscall"
+	}
+
+	return "NONE"
+}