Add readme

Author: igor-vovk

examples/connectrpc_grpc_servers/README.md

@@ -3,17 +3,24 @@
 This example demonstrates the pattern of starting both a gRPC server and a ConnectRPC server in the same component on
 different ports.
 
+The logic behind is that gRPC server is used for internal communication, while ConnectRPC server is proxied by a reverse
+proxy to handle external http requests coming from the frontend.
+
 Example shows that the same service is run by both servers, and the gRPC server is used to handle
 gRPC requests, while the ConnectRPC server is used to handle ConnectRPC requests.
 
 Dependencies are wired using [Cedi](https://github.com/igor-vovk/cedi) library.
 
 Testing the ConnectRPC server:
+
 1. Start the server by running:
+
 ```bash
 sbt example_connectrpc_grpc_servers/run
 ```
+
 2. Use `curl` to send http requests to the ConnectRPC server:
+
 ```bash
 curl -X POST http://localhost:8080/examples.v1.ElizaService/Say -d '{"sentence": "Hello Connectrpc"}' -H 'Content-Type: application/json'
 ```