Update README.md

Author: iam-veeramalla

src/product-catalog/README.md

@@ -2,17 +2,18 @@
 
 When this service is run the output should be similar to the following
 
-```json
-{"message":"successfully parsed product catalog json","severity":"info","timestamp":"2022-06-02T23:54:10.191283363Z"}
-{"message":"starting grpc server at :3550","severity":"info","timestamp":"2022-06-02T23:54:10.191849078Z"}
+```
+INFO[0000] Loaded 10 products                           
+INFO[0000] Product Catalog gRPC server started on port: 8088 
 ```
 
 ## Local Build
 
 To build the service binary, run:
 
 ```sh
-go build -o /go/bin/product-catalog/
+export PRODUCT_CATALOG_PORT=<any-unique-port>
+go build -o product-catalog . 
 ```
 
 ## Docker Build