add breadcrumbs

api/main.proto

@@ -22,6 +22,11 @@ service CRM {
       get: "/products/{id}"
     };
   }
+  rpc GetBreadcrumbs(GetBreadcrumbsReq) returns (BreadcrumbsRsp) {
+    option (google.api.http) = {
+      get: "/breadcrumbs/{id}"
+    };
+  }
 }
 
 message GetCatalogReq {}
@@ -81,10 +86,18 @@ message Characteristic {
   string value = 2;
 }
 
-message GetProductReq{
+message GetProductReq {
   int64 id = 1;
 }
 
 message ProductRsp {
   Product product = 1;
 }
+
+message GetBreadcrumbsReq {
+  int64 id = 1;
+}
+
+message BreadcrumbsRsp {
+  repeated Category categories = 1;
+}