add source code and readme

manifests/applications/mastodon/repository.yaml

@@ -0,0 +1,16 @@
+---
+apiVersion: source.toolkit.fluxcd.io/v1
+kind: GitRepository
+metadata:
+  name: mastodon-chart
+  namespace: mastodon-application
+spec:
+  interval: 5m
+  url: https://github.com/mastodon/chart
+  ref:
+    branch: main
+  ignore: |
+    /*
+    !/Chart.yaml
+    !/values.yaml
+    !/templates/**