doc: plugin parameters

Add documentation for the parameters that can be set for the plugin.

Closes #327

Signed-off-by: Francesco Canovai <[email protected]>

Author: fcanovai

web/docs/parameters.md

@@ -0,0 +1,18 @@
+---
+sidebar_position: 100
+---
+
+# Parameters
+
+<!-- SPDX-License-Identifier: CC-BY-4.0 -->
+
+The following parameters are available for the Barman Cloud Plugin:
+
+- `barmanObjectName`: references the `ObjectStore` resource to be used by the
+  plugin.
+- `serverName`: Specifies the server name in the object store.
+
+:::important
+  The `serverName` parameter within the `ObjectStore` resource exists only for
+  API compatibility with the in-tree `barmanObjectStore` and is ignored by the
+  plugin. Use the `serverName` plugin parameter when needed.