Auto assign admins to issues (#25)

Author: JamyGolden

.github/CODEOWNERS

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+* @tinted-theming/schemes

.github/workflows/auto-assign-issues.yml

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+name: Auto assignment for issues
+
+on:
+  issues:
+    types: [opened]
+
+jobs:
+  auto-assign:
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+    steps:
+      - name: 'Auto-assign issue'
+        uses: pozil/auto-assign-issue@v2
+        with:
+          repo-token: ${{ secrets.BOT_ACCESS_TOKEN }}
+          teams: schemes
+          numOfAssignee: 3