chore: add contributors and stargazers

.github/workflows/contributors.yml

@@ -0,0 +1,35 @@
+name: Contributors
+on:
+  push:
+    branches:
+      - master
+jobs:
+  contributors:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: wow-actions/contributors-list@v1
+        with:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          svgPath: CONTRIBUTORS.svg
+          sort: true
+          round: true
+          includeBots: false
+          userNameHeight: 19
+          # This job does not have commit powers to the `master` branch
+          noCommit: true
+          itemTemplate: >
+            <g transform="translate({{ x }}, {{ y }})">
+              <a xlink:href="{{{ url }}}" class="contributor-link" target="_blank" rel="nofollow sponsored" title="{{{ name }}}" id="{{{ name }}}">
+                <image width="{{ width }}" height="{{ height }}" xlink:href="{{{ avatar }}}" />
+                <text x="32" y="74" text-anchor="middle" alignment-baseline="middle" font-size="10">{{{ name }}}</text>
+              </a>
+            </g>
+      - name: Create Pull Request
+        uses: peter-evans/create-pull-request@v3
+        with:
+          commit-message: '[chore] update contributors svg'
+          title: '[chore] update contributors svg'
+          delete-branch: true
+          assignees: gutmensch
+          reviewers: gutmensch

README.md

@@ -107,3 +107,11 @@ When the size exceeds the maximum, one could experience an error `Uncaught Value
 ```yaml
 - "PARSER_XML_MAXSIZE=500000"
 ```
+
+## Contributors
+
+<img src="./CONTRIBUTORS.svg">
+
+## Stargazers over time
+
+[![Stargazers over time](https://starchart.cc/gutmensch/docker-dmarc-report.svg)](https://starchart.cc/gutmensch/docker-dmarc-report)