Add PR template and changelog generator

.github/PULL_REQUEST_TEMPLATE.md

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+## Summary
+
+
+## Checklist
+
+- [ ] Try to isolate changes into separate PRs (to build a better changelog).
+- [ ] Categorize the PR by setting a good title and adding one of the labels:
+      `change`, `decision`, `requirement/quality`, `requirement/functional`, `dependency`
+      as they show up in the changelog
+- [ ] Link this PR to related issues if applicable.
+
+<!--
+NOTE:
+- Remove items that do not apply.
+- These things are not required to open a PR and can be done afterwards, while the PR is open.
+-->

.github/changelog-configuration.json

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+{
+    "pr_template": "- ${{TITLE}} (#${{NUMBER}})",
+    "categories": [
+        {
+            "title": "## ⚖️ Decisions",
+            "labels": ["decision"]
+        },
+        {
+            "title": "## 📕 Tutorials",
+            "labels": ["tutorial"]
+        },
+        {
+            "title": "## 🧾 Quality Requirements",
+            "labels": ["requirement/quality"]
+        },
+        {
+            "title": "## 📄 Functional Requirements",
+            "labels": ["requirement/functional"]
+        },
+        {
+            "title": "## 🛠️ Minor Changes",
+            "labels": ["change"]
+        },
+        {
+            "title": "## 🔗 Dependency Updates",
+            "labels": ["dependency"]
+        }
+    ],
+    "template": "${{CATEGORIZED_COUNT}} changes since ${{FROM_TAG}}\n\n${{CHANGELOG}}"
+}

.github/workflows/release.yml

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+name: Release
+on:
+  push:
+    tags:
+    - v*
+
+jobs:
+  dist:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        fetch-depth: "0"
+    - name: Build changelog from PRs with labels
+      id: build_changelog
+      uses: mikepenz/release-changelog-builder-action@v2
+      with:
+        configuration: ".github/changelog-configuration.json"
+        # PreReleases still get a changelog, but the next full release gets a diff since the last full release,
+        # combining possible changelogs of all previous PreReleases in between.
+        # PreReleases show a partial changelog since last PreRelease.
+        ignorePreReleases: "${{ !contains(github.ref, '-rc') }}"
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+    - name: Create Release
+      uses: ncipollo/release-action@v1
+      with:
+        body: ${{steps.build_changelog.outputs.changelog}}
+        prerelease: "${{ contains(github.ref, '-rc') }}"
+        # Ensure target branch for release is "master"
+        commit: master
+        token: ${{ secrets.GITHUB_TOKEN }}