Add configuration file for Dependabot used to create PR when selected submodules are updated

.github/dependabot.yml

@@ -0,0 +1,18 @@
+# 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/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
+
+version: 2
+updates:
+  - package-ecosystem: gitsubmodule
+    directory: "/"
+    allow:
+      - dependency-name: "ThirdParty/fast_float"
+      - dependency-name: "ThirdParty/qtadvanceddocking"
+      - dependency-name: "ThirdParty/regression-analysis"
+      - dependency-name: "ThirdParty/roff-cpp"
+      - dependency-name: "ThirdParty/spdlog"
+      - dependency-name: "ThirdParty/tomlplusplus"
+    schedule:
+      interval: "weekly"