dev: add proto file

lib/proto/youtube.proto

@@ -0,0 +1,13 @@
+syntax = "proto2";
+package proto;
+
+enum FOO {
+  BAR = 1;
+}
+
+message ChannelPreferences {
+  required string channel_id = 1;
+  string pref_code  = 2;
+  int32 number_0 = 3;
+  int32 number_1 = 4;
+}