Disk partitioning

Ability to create partitions on empty disks.

Change-Id: I0a71da9d62d8f7df3fa03e3f34d49bad6988ba6d
diff --git a/README.rst b/README.rst
index 51e6370..ca6d005 100644
--- a/README.rst
+++ b/README.rst
@@ -1269,6 +1269,28 @@
                   size: 40G
                   mount: ${linux:storage:mount:data}
 
+Create partitions on disk. Specify size in MB. It expects empty
+disk without any existing partitions.
+
+.. code-block:: yaml
+
+      linux:
+        storage:
+          disk:
+            first_drive:
+              name: /dev/loop1
+              type: gpt
+              partitions:
+                - size: 200 #size in MB
+                  type: fat32
+                - size: 300 #size in MB
+                  type: ext4
+            /dev/vda1:
+              partitions:
+                - size: 5
+                  type: ext2
+                - size: 10
+                  type: ext4
 
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