[internal] add snapshot-controller requirement info (#117)

Signed-off-by: v.oleynikov <[email protected]>

Author: duckhawk

docs/README.md

@@ -16,6 +16,10 @@ When creating snapshots of NFS volumes, it's important to understand their creat
 4. NFS does not ensure atomicity of operations at the file system level when creating a snapshot.
 {{< /alert >}}
 
+{{< alert level="info" >}}
+For working with snapshots, the [snapshot-controller](../../snapshot-controller/) module must be connected.
+{{< /alert >}}
+
 {{< alert level="info" >}}
 Creating a StorageClass for the CSI driver `nfs.csi.k8s.io` by the user is prohibited.
 {{< /alert >}}

docs/README_RU.md

@@ -17,6 +17,10 @@ description: "Модуль csi-nfs: общие концепции и полож
 
 {{< /alert >}}
 
+{{< alert level="info" >}}
+Для работы с снапшотами требуется подключенный модуль [snapshot-controller](../../snapshot-controller/).
+{{< /alert >}}
+
 {{< alert level="info" >}}
 Создание StorageClass для CSI-драйвера `nfs.csi.k8s.io` пользователем запрещено.
 {{< /alert >}}