readme update for api call sample

Author: vinodnextcoder

README.md

@@ -8,3 +8,16 @@ cd simple-http-server
  go run server.go
 
 ````
+
+# to call api endpoint in postman
+
+```
+for gin-server
+http://localhost:3000
+
+for simpe-http-server
+http://localhost:3000
+
+http://localhost:3000/headers
+
+```

simple-http-server/server.go

@@ -21,7 +21,7 @@ func headers(w http.ResponseWriter, req *http.Request) {
 
 func main() {
 
-	http.HandleFunc("/hello", hello)
+	http.HandleFunc("/", hello)
 	http.HandleFunc("/headers", headers)
 
 	http.ListenAndServe(":3000", nil)