Add schema

schema.yaml

@@ -0,0 +1,34 @@
+$schema: http://json-schema.org/draft/2020-12/schema
+type: object
+properties:
+  entries:
+    type: array
+    items:
+      type: object
+      properties:
+        name:
+          type: string
+          description: Name of the feed
+        url:
+          type: string
+          description: Rss feed url of the podcast
+        limit:
+          type: integer
+          description: Number of entries to download
+        filename_type:
+          type: string
+          description: Decides how the files are named
+          enum:
+            - title
+            - date
+        filter:
+          type: string
+          description: yq filter expression
+          foobar: hello world
+      required:
+        - filename_type
+        - limit
+        - name
+        - url
+required:
+  - entries