docs: add blomp cloud storage guide

backend/swift/swift.go

@@ -100,7 +100,7 @@ but other operations such as Remove and Copy will fail.
 func init() {
 	fs.Register(&fs.RegInfo{
 		Name:        "swift",
-		Description: "OpenStack Swift (Rackspace Cloud Files, Memset Memstore, OVH)",
+		Description: "OpenStack Swift (Rackspace Cloud Files, Blomp Cloud Storage, Memset Memstore, OVH)",
 		NewFs:       NewFs,
 		Options: append([]fs.Option{{
 			Name:    "env_auth",
@@ -142,6 +142,9 @@ func init() {
 			}, {
 				Value: "https://auth.cloud.ovh.net/v3",
 				Help:  "OVH",
+			}, {
+				Value: "https://authenticate.ain.net",
+				Help:  "Blomp Cloud Storage",	
 			}},
 		}, {
 			Name: "user_id",