feat: add dependabot for this project for minor and patch updates for nuget packages and github actions

.github/dependabot.yml

@@ -0,0 +1,52 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  # Maintain dependencies for GitHub Actions
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "monthly"
+    open-pull-requests-limit: 3
+  - package-ecosystem: "nuget"
+    directory: "/src/NSubstitute"
+    schedule:
+      interval: "monthly"
+    open-pull-requests-limit: 3
+    groups:
+      nsubstitute_minor_patch_updates:
+        update-types:
+        - "minor"
+        - "patch"
+    ignore:
+      - dependency-name: "*"
+        update-types: ["version-update:semver-major"]
+  - package-ecosystem: "nuget"
+    directory: "/tests/NSubstitute.Acceptance.Specs"
+    schedule:
+      interval: "monthly"
+    open-pull-requests-limit: 3
+    groups:
+      nsubstitute_acceptance_specs_minor_patch_updates:
+        update-types:
+        - "minor"
+        - "patch"
+    ignore:
+      - dependency-name: "*"
+        update-types: ["version-update:semver-major"]
+  - package-ecosystem: "nuget"
+    directory: "/tests/NSubstitute.Benchmarks"
+    schedule:
+      interval: "monthly"
+    open-pull-requests-limit: 3
+    groups:
+      nsubstitute_benchmarks_minor_patch_updates:
+        update-types:
+        - "minor"
+        - "patch"
+    ignore:
+      - dependency-name: "*"
+        update-types: ["version-update:semver-major"]