Add dependabot file (#89)

Author: bryan-aguilar

.github/dependabot.yml

@@ -0,0 +1,23 @@
+version: 2
+updates:
+
+  # Maintain dependencies for GitHub Actions
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: sunday
+
+  # Maintain dependencies for npm
+  - package-ecosystem: "npm"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: sunday
+
+  # Maintain dependencies for Composer
+  - package-ecosystem: "npm"
+    directory: "/sample-apps"
+    schedule:
+      interval: "weekly"
+      day: sunday