First draft of implementation

Readme will follow

.github/dependabot.yml

@@ -0,0 +1,17 @@
+version: 2
+updates:
+  - package-ecosystem: maven
+    directory: /
+    schedule:
+      interval: daily
+    allow:
+      - dependency-name: org.keycloak:keycloak-parent
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: monthly
+      day: monday
+      # github parses time without quotes to int
+      # yamllint disable-line rule:quoted-strings
+      time: "09:00"
+      timezone: Europe/Berlin