chore: add repository catalog entity

Adds Component with spec.type: repository for Backstage software catalog.

Related: IDP-538

Author: JakobNagaoka

backstage.yaml

@@ -0,0 +1,15 @@
+---
+apiVersion: backstage.io/v1alpha1
+kind: Component
+metadata:
+  name: mmdetection
+  description: OpenMMLab Detection Toolbox and Benchmark
+  annotations:
+    github.com/project-slug: caddijp/mmdetection
+    backstage.io/source-location: url:https://github.com/caddijp/mmdetection
+  tags:
+    - touches-customer-data
+spec:
+  type: repository
+  lifecycle: production
+  owner: group:TODO-set-owner