Readme sponsors (#5789)

* Add sponsors action

- Automatically show list of project sponsors
- Ref: https://github.com/JamesIves/github-sponsors-readme-action

* Update README.md

* Pin workflow action versions

.github/workflows/sponsors.yml

@@ -0,0 +1,23 @@
+name: Generate Sponsors README
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: 30 15 * * 0-6
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout 🛎️
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11
+
+      - name: Generate Sponsors 💖
+        uses: JamesIves/github-sponsors-readme-action@a2d75a8d58b117b19777a910e284ccb082aaf117
+        with:
+          token: ${{ secrets.INVENTREE_SPONSORS_TOKEN }}
+          file: 'README.md'
+
+      - name: Deploy to GitHub Pages 🚀
+        uses: JamesIves/github-pages-deploy-action@a1ea191d508feb8485aceba848389d49f80ca2dc
+        with:
+          branch: main
+          folder: '.'