feat: add theater proto

proto/theater.proto

@@ -0,0 +1,37 @@
+syntax = "proto3";
+
+package theater.v1;
+
+import "google/protobuf/empty.proto";
+
+service TheaterService {
+  rpc ListTheater(google.protobuf.Empty) returns (ListTheaterResponse);
+  rpc GetTheater(GetTheaterRequest) returns (GetTheaterResponse);
+  rpc CreateTheater(CreateTheaterRequest) returns (CreateTheaterResponse);
+}
+
+message ListTheaterResponse {
+  repeated Theater theaters = 1;
+}
+
+message GetTheaterRequest {
+  string id = 1;
+}
+
+message GetTheaterResponse {
+  Theater theater = 1;
+}
+
+message CreateTheaterRequest {
+  string name = 1;
+  string address = 2;
+}
+message CreateTheaterResponse {
+  bool ok = 1;
+}
+
+message Theater {
+  string id = 1;
+  string name = 2;
+  string address = 3;
+}