add game

api/main.proto

@@ -45,6 +45,12 @@ service EveningDetective {
     };
   }
 
+  rpc GetGame(GetGameReq) returns (GetGameRsp) {
+    option (google.api.http) = {
+      get: "/game"
+    };
+  }
+
   rpc GameStart(GameStartReq) returns (GameStartRsp) {
     option (google.api.http) = {
       post: "/game/start",
@@ -137,6 +143,12 @@ message Action {
   repeated Application applications = 5;
 }
 
+message GetGameReq {}
+
+message GetGameRsp {
+  string state = 1;
+}
+
 message GameStartReq {}
 
 message GameStartRsp {}