Add custom app default information

catalog_reader/custom_app.py

@@ -0,0 +1,30 @@
+APP_VERSION = 'custom'
+VERSION = '1.0.0'
+
+
+def get_version_details() -> dict:
+    """
+    This is basically a stub which will be used in middleware to get version details of custom app
+    """
+    return {
+        'app_metadata': {
+            'name': 'custom-app',
+            'train': 'stable',
+            'version': VERSION,
+            'app_version': APP_VERSION,
+            'title': 'Custom App',
+            'description': 'This is a custom app where user can use his/her '
+                           'own docker compose file for deploying services',
+            'home': '',
+            'sources': [],
+            'maintainers': [],
+            'run_as_context': [],
+            'capabilities': [],
+            'host_mounts': [],
+        },
+        'version': VERSION,
+        'human_version': f'{VERSION}_{APP_VERSION}',
+        'supported': True,
+        'healthy': True,
+        'healthy_error': None,
+    }