feat: add readme

README.md

@@ -0,0 +1,23 @@
+# Kaniko Action
+
+Build OCI images using Kaniko, with the Dockerfile contents provided directly as an action input.
+
+## Usage
+
+Example:
+
+```yaml
+jobs:
+  cowsay:
+    runs-on: docker
+    steps:
+      - uses: https://git.kabelsalat.ch/s3lph/forgejo-kaniko-action@v1
+        with:
+          dockerfile: |
+            FROM debian:latest
+            RUN apt update && apt install --yes cowsay
+          image: docker.example.org/example/cowsay:latest
+          registry: docker.example.org
+          username: ${{ secrets.REGISTRY_USERNAME }}
+          password: ${{ secrets.REGISTRY_PASSWORD }}
+```