Add Collection interface.

The interface has a single method now called 'DeleteAll'.

Change-Id: Ifd4d4046f614dfbe622adb5820bceae2847bdec8
Signed-off-by: Nagaraju Goruganti <ngorugan@in.ibm.com>
diff --git a/xyz/openbmc_project/Collection/DeleteAll.interface.yaml b/xyz/openbmc_project/Collection/DeleteAll.interface.yaml
new file mode 100755
index 0000000..eba6b5f
--- /dev/null
+++ b/xyz/openbmc_project/Collection/DeleteAll.interface.yaml
@@ -0,0 +1,6 @@
+description: >
+    Implement to provide operations on a collection of objects.
+methods:
+    - name: DeleteAll
+      description: >
+         Delete all objects in the collection.