Auto Assign Pull Requests (#791)

* Created Codeowners file

* Added PR auto assignment to Chris

* Removed assignee from workflow. Added separate file

* Updated the steps to use 2.0. Removed default assignees

* Put auto_assign.yml in the wrong place.

* Updated naming convention. Closes #746

Author: ckenst

.github/auto_assignee.yml

@@ -0,0 +1,3 @@
+addAssignees: true
+assignees:
+  - ckenst

.github/workflows/auto-assign.yml

@@ -0,0 +1,14 @@
+name: Auto Assign PRs
+
+on:
+  pull_request:
+    types: [opened, reopened, synchronize, ready_for_review]
+
+jobs:
+  add_assignees:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: kentaro-m/[email protected]
+        with:
+          configuration-path: .github/auto_assignee.yml
+          repo-token: ${{ secrets.GITHUB_TOKEN }}