Add dependabot configuration

Author: Garo Yeriazarian

.github/dependabot.yml

@@ -0,0 +1,45 @@
+version: 2
+updates:
+  # NuGet dependencies for .NET API
+  - package-ecosystem: "nuget"
+    directory: "/src/api"
+    schedule:
+      interval: "weekly"
+      day: "monday"
+    open-pull-requests-limit: 5
+    labels:
+      - "dependencies"
+      - "dotnet"
+
+  # npm dependencies for web frontend
+  - package-ecosystem: "npm"
+    directory: "/src/web"
+    schedule:
+      interval: "weekly"
+      day: "monday"
+    open-pull-requests-limit: 5
+    labels:
+      - "dependencies"
+      - "frontend"
+
+  # npm dependencies for tests
+  - package-ecosystem: "npm"
+    directory: "/tests"
+    schedule:
+      interval: "weekly"
+      day: "monday"
+    open-pull-requests-limit: 5
+    labels:
+      - "dependencies"
+      - "testing"
+
+  # GitHub Actions workflows
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: "monday"
+    open-pull-requests-limit: 5
+    labels:
+      - "dependencies"
+      - "github-actions"