Added Mach-O file format

src/macho/Header.go

@@ -0,0 +1,13 @@
+package macho
+
+// Header contains general information.
+type Header struct {
+	Magic             uint32
+	Architecture      CPU
+	MicroArchitecture uint32
+	Type              HeaderType
+	NumCommands       uint32
+	SizeCommands      uint32
+	Flags             HeaderFlags
+	Reserved          uint32
+}