Add new resources, extend fields in config

pkg/cloudbroker/rg/usage.go

@@ -0,0 +1,44 @@
+package rg
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"net/http"
+)
+
+type UsageRequest struct {
+	RGID   uint64 `url:"rgId"`
+	Reason string `url:"reason,omitempty"`
+}
+
+func (rgrq UsageRequest) Validate() error {
+	if rgrq.RGID == 0 {
+		return errors.New("validation-error: field RGID must be set")
+	}
+
+	return nil
+}
+
+func (r RG) Usage(ctx context.Context, req UsageRequest) (*Reserved, error) {
+	err := req.Validate()
+	if err != nil {
+		return nil, err
+	}
+
+	url := "/cloudbroker/rg/usage"
+
+	res, err := r.client.DecortApiCall(ctx, http.MethodPost, url, req)
+	if err != nil {
+		return nil, err
+	}
+
+	usage := Reserved{}
+
+	err = json.Unmarshal(res, &usage)
+	if err != nil {
+		return nil, err
+	}
+
+	return &usage, nil
+}