Add Release Drafter bot (#74)

.github/release-drafter.yml

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+prerelease: true
+categories:
+  - title: 'Features'
+    labels:
+      - 'feature'
+      - 'enhancement'
+  - title: 'Bug Fixes'
+    labels:
+      - 'fix'
+      - 'bugfix'
+      - 'bug'
+  - title: 'Maintenance'
+    label: 'chore'
+change-template: '- $TITLE (#$NUMBER)'
+change-title-escapes: '\<*_&' # You can add # and @ to disable mentions, and add ` to disable code blocks.
+template: |
+  ## Changes
+
+  $CHANGES

.github/workflows/release-drafter.yml

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+name: Release Drafter
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  update_release_draft:
+    runs-on: ubuntu-latest
+    steps:
+      # Drafts your next Release notes as Pull Requests are merged into main
+      - uses: release-drafter/release-drafter@v5
+        with:
+          # (Optional) specify config name to use, relative to .github/. Default: release-drafter.yml
+          config-name: release-drafter.yml
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}