chore: update README.md

Author: MarcoFontana48

README.md

@@ -18,4 +18,28 @@ to only stop the project and remove all containers, networks, images and volumes
 
 ```bash
 docker-compose down --rmi all -v
+```
+
+to test if the application is running, you can use the following command (windows), if linux remove the `.exe`. It sends an health check request to the API Gateway of the application:
+
+```bash
+curl.exe -X GET http://localhost:8080/health
+```
+
+or
+
+```bash
+curl http://localhost:8080/health
+```
+
+to check if the application reaches the service from api-gateway:
+
+```bash
+curl.exe http://localhost:8080/service/health
+```
+
+to check all endpoints that can be reached from the API Gateway, you can use the following command:
+
+```bash
+curl.exe http://localhost:8080/route
 ```

api_gateway/go.sum

@@ -0,0 +1,2 @@
+github.com/gorilla/mux v1.8.1 h1:TuBL49tXwgrFYWhqrNgrUNEY92u81SPhu7sTdzQEiWY=
+github.com/gorilla/mux v1.8.1/go.mod h1:AKf9I4AEqPTmMytcMc0KkNouC66V3BtZ4qD5fmWSiMQ=

service/go.sum

@@ -0,0 +1,2 @@
+github.com/gorilla/mux v1.8.1 h1:TuBL49tXwgrFYWhqrNgrUNEY92u81SPhu7sTdzQEiWY=
+github.com/gorilla/mux v1.8.1/go.mod h1:AKf9I4AEqPTmMytcMc0KkNouC66V3BtZ4qD5fmWSiMQ=