vendor: add github.com/koofr/go-koofrclient

* added koofr client SDK dep for koofr backend

vendor/github.com/koofr/go-koofrclient/client_shared.go

@@ -0,0 +1,25 @@
+package koofrclient
+
+import (
+	"net/http"
+
+	"github.com/koofr/go-httpclient"
+)
+
+func (c *KoofrClient) Shared() (shared []Shared, err error) {
+	d := &struct {
+		Files *[]Shared
+	}{&shared}
+
+	request := httpclient.RequestData{
+		Method:         "GET",
+		Path:           "/api/v2/shared",
+		ExpectedStatus: []int{http.StatusOK},
+		RespEncoding:   httpclient.EncodingJSON,
+		RespValue:      &d,
+	}
+
+	_, err = c.Request(&request)
+
+	return
+}