define the first version of the protocol buffers

Aircraft.proto

@@ -0,0 +1,19 @@
+syntax = "proto3";
+package vatger.aman;
+
+message Aircraft {
+    enum EngineType {
+        UNKNOWN   = 0;
+        ELECTRIC  = 1;
+        TURBOPROB = 2;
+        JET       = 3;
+    }
+
+    string     callsign    = 1; // aircraft's callsign
+    string     airline     = 2; // corresponding airline
+    string     type        = 3; // aircraft ICAO type
+    string     wtc         = 4; // WTC
+    string     wakeRecat   = 5; // wake recatogization category
+    Int32      engineCount = 6; // number of engines
+    EngineType engineType  = 7; // engine type
+}