Add resources to gRPC document

docs/en/solution-templates/microservice/grpc-calls.md

@@ -12,6 +12,14 @@
 
 > You must have an ABP Business or a higher license to be able to create a microservice solution.
 
+## What is gRPC?
+
 You can use [gRPC](https://grpc.io) to enable high-performance, low-latency communication between microservices. gRPC, or Google Remote Procedure Call, is an open-source remote procedure call system initially developed by Google. It uses HTTP/2 for transport, Protocol Buffers as the interface description language, and provides features such as authentication, load balancing, and more.
 
-For inter-service communication, gRPC is a great choice because it is faster and more efficient than REST. It is also language-agnostic, meaning you can use it with any programming language that supports gRPC. ABP does not restrict you to use gRPC; you can use it just like normal .NET applications.
+## Learning Resources
+
+The microservice startup template hasn't any configuration related to gRPC communication. You can see the following resources to learn how to implement gRPC calls between your services:
+
+* [Using gRPC with the ABP Framework](https://abp.io/community/articles/using-grpc-with-the-abp-framework-2dgaxzw3) (ABP Community article)
+* [Overview for gRPC on .NET](https://learn.microsoft.com/en-us/aspnet/core/grpc/) (Microsoft's documentation)
+* [Code-first gRPC services and clients with .NET](https://learn.microsoft.com/en-us/aspnet/core/grpc/code-first) (Microsoft's documentation)