Starting on the Protocol Buffers tutorial

protobuf/src/tutorial/addressbook.proto

@@ -0,0 +1,24 @@
+package tutorial;
+
+message Person {
+    required string name = 1;
+    required int32 id = 2;
+    optional string email = 3;
+
+    enum PhoneType {
+        MOBILE = 0;
+        HOME = 1;
+        WORK = 2;
+    }
+
+    message PhoneNumber {
+        required string number = 1;
+        optional PhoneType type = 2 [default = HOME];
+    }
+
+    repeated PhoneNumber phone = 4;
+}
+
+message AddressBook {
+    repeated Person person = 1;
+}