Add: virt_volume doc

virt_volume/README.md

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+# Virt Volume
+
+Create a single libvirt volume.
+
+This module helps to create a single volume. As dmarcvicar/terraform-libvirt does not support persistant volumes, the persistant volume support is quite limited. The only case where persistants volumes are supported is in the case of new volume creation, which in turn become idempotent and will be never destroyed ever. 
+
+* Created:
+  * Desc: Created as new disk
+  * Ephemeral: True
+  * Persistant: True
+* Backed:
+  * Desc: Backed image from source volume
+  * Ephemeral: True
+  * Persistant: False
+* Sourced:
+  * Desc: Downloaded image from url
+  * Ephemeral: True
+  * Persistant: False
+
+
+<!-- BEGIN_TF_DOCS -->
+<!-- END_TF_DOCS -->