Add Dependabot, CODEOWNERS and PR template

.github/CODEOWNERS

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+# Reviewers requested automatically on every pull request.
+* @JustinaPetr

.github/dependabot.yml

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+version: 2
+updates:
+  # Each sample app needs its own entry, pointing at the folder that holds its package.json.
+  - package-ecosystem: npm
+    directory: /app-client-starter-app
+    schedule:
+      interval: weekly
+    groups:
+      minor-and-patch:
+        update-types: [minor, patch]
+
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly

.github/pull_request_template.md

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+## What does this change?
+
+<!-- A short description of the change and why it's needed. -->
+
+## How was it tested?
+
+<!-- e.g. ran the app locally, added or updated tests. -->
+
+## Checklist
+
+- [ ] `npm test` and `npm run lint` pass for any app I changed
+- [ ] No secrets, tokens or `.env` files are committed
+- [ ] README updated if setup or behavior changed