Add: Documentation for git-use-https Action

git-use-https/README.md

@@ -0,0 +1,26 @@
+# Use HTTPS for Git data transfer
+
+GitHub Action to use Git over HTTPS with OAuth instead of SSH to transfer data to GitHub. This fixes cloning private GitHub repositories, when unable to use `actions/checkout`.
+
+#### Use Case
+
+```yaml
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: "Use HTTPS for GitHub data transfer"
+        uses: greenbone/actions/git-use-https@v3
+        with:
+          token: ${{ secrets.GREENBONE_BOT_TOKEN }}
+      - name: Setup Poetry with private GitHub repository as dependency
+        uses: greenbone/actions/poetry@v3
+```
+
+## Action Configuration
+
+| Input Variable          | Description                                                                     |          |
+| ----------------------- | ------------------------------------------------------------------------------- | -------- |
+| token                   | OAuth 2.0 token to use for authentication                                       | Required |