Create Dependabot config file (#3273)

* Create Dependabot config file

* Add yarn, Github Actions, & link to docs

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>
Co-authored-by: Tom Morris <tfmorris@gmail.com>

.github/dependabot.yml

@@ -0,0 +1,23 @@
+# Documentation for all configuration options:
+# https://help.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+- package-ecosystem: maven
+  directory: "/"
+  schedule:
+    interval: daily
+  open-pull-requests-limit: 10
+  ignore:
+  - dependency-name: com.thoughtworks.xstream:xstream
+    versions:
+    - "> 1.4.12"
+    - "< 2"
+- package-ecosystem: "npm" # For Yarn
+  directory: "/"
+  schedule:
+    interval: "daily"
+- package-ecosystem: "github-actions"
+  directory: "/"
+  schedule:
+    interval: "daily"