Inventory: Add Decorator.Dimension interface

Inventory items can report their dimensions (if applicable and
if specified by the manufacturer) via management APIs like Redfish.

For this purpose, this commit introduces a Decorator.Dimension
interface containing the following properties:

1. Height - The height of the item in meters.
2. Width - The width of the item in meters.
3. Depth - The depth of the item in meters.

Signed-off-by: Sharad Yadav <sharady@nvidia.com>
Change-Id: I2ac2dcd9743e8991c05eaf68acf856553ceecc55
diff --git a/yaml/xyz/openbmc_project/Inventory/Decorator/Dimension.interface.yaml b/yaml/xyz/openbmc_project/Inventory/Decorator/Dimension.interface.yaml
new file mode 100644
index 0000000..8b3445b
--- /dev/null
+++ b/yaml/xyz/openbmc_project/Inventory/Decorator/Dimension.interface.yaml
@@ -0,0 +1,16 @@
+description: >
+    Implement to provide physical dimension attributes.
+
+properties:
+    - name: Height
+      type: double
+      description: >
+          The height in meters.
+    - name: Width
+      type: double
+      description: >
+          The width in meters.
+    - name: Depth
+      type: double
+      description: >
+          The depth in meters.