add user service

pkg/api/apiCall.go

@@ -0,0 +1,31 @@
+package api
+
+import (
+	"bytes"
+	"encoding/json"
+	"io"
+	"net/http"
+)
+
+func PostRequest(url string, model any) ([]byte, error) {
+	uJson, err := json.Marshal(model)
+
+	if err != nil {
+		return nil, err
+	}
+
+	resp, err := http.Post(url,
+		"application/json", bytes.NewReader(uJson))
+
+	if err != nil {
+		return nil, err
+	}
+
+	data, err := io.ReadAll(resp.Body)
+
+	if err != nil {
+		return nil, err
+	}
+
+	return data, nil
+}