provider/docker: Add docker_volume resource

r/volume.html.markdown

@@ -0,0 +1,38 @@
+---
+layout: "docker"
+page_title: "Docker: docker_volume"
+sidebar_current: "docs-docker-resource-volume"
+description: |-
+  Creates and destroys docker volumes.
+---
+
+# docker\_volume
+
+Creates and destroys a volume in Docker. This can be used alongside
+[docker\_container](/docs/providers/docker/r/container.html)
+to prepare volumes that can be shared across containers.
+
+## Example Usage
+
+```
+# Creates a docker volume "shared_volume".
+resource "docker_volume" "shared_volume" {
+    name = "shared_volume"
+}
+
+# Reference the volume with ${docker_volume.shared_volume.name}
+```
+
+## Argument Reference
+
+The following arguments are supported:
+
+* `name` - (Optional, string) The name of the Docker volume (generated if not provided).
+* `driver` - (Optional, string) Driver type for the volume (defaults to local).
+* `driver_opts` - (Optional, map of strings) Options specific to the driver.
+
+## Attributes Reference
+
+The following attributes are exported in addition to the above configuration:
+
+* `mountpoint` (string) - The mountpoint of the volume.