add source.list, source.create and source.get messages

messages/v1/types/source.yml

@@ -0,0 +1,20 @@
+---
+title: Source
+type: object
+description: Description d'un source.
+properties:
+  source_id:
+    type: number
+    description: ID de la source.
+    ref: Source.SourceId
+  source_name:
+    type: string
+    description: Nom de la source.
+  source_url:
+    type: string
+    description: URL de téléchargement de la source.
+
+required:
+  - source_id
+  - source_name
+  - source_url