Added Metadata Children endpoint

pms/paths/metadata-children.yaml

@@ -0,0 +1,22 @@
+get:
+  tags:
+    - Library
+  summary: Get Items Children
+  description: |
+    This endpoint will return the children of of a library item specified with the ratingKey.
+  operationId: getMetadataChildren
+  parameters:
+    - name: ratingKey
+      description: the id of the library item to return the children of.
+      in: path
+      schema:
+        type: number
+      required: true
+
+  responses:
+    "200":
+      description: The children of the library item.
+    "400":
+      $ref: "../../responses/400.yaml"
+    "401":
+      $ref: "../../responses/401.yaml"

pms/pms-spec.yaml

@@ -147,6 +147,8 @@ paths:
     $ref: "./paths/library-content-latest.yaml"
   /library/sections/{sectionId}/common:
     $ref: "./paths/library-content-common.yaml"
+  /library/metadata/{ratingKey}/children:
+    $ref: "./paths/metadata-children.yaml"
   /library/onDeck:
     $ref: "./paths/library-ondeck.yaml"