feat: add readme

README.md

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+# kubectl-action
+GitHub Action to manage a K8s (Kubernetes) cluster using kubectl.
+
+# Usage
+To use this action, add the following step to your GitHub Action workflow:
+```yaml
+- uses: tale/kubectl-action@v1
+  with:
+    base64-kube-config: ${{ secrets.KUBE_CONFIG }}
+```
+
+Keep in mind that the action expects a base64 encoded string of your Kubernetes configuration. The simplest way to do that is to run `cat $HOME/.kube/config | base64` and save that output as an action secret.
+
+It's also possible to specify the version of the [kubectl](https://kubernetes.io/docs/reference/kubectl/) CLI to use. The current default release used by this action is `v1.23.0`.
+```yaml
+- uses: tale/kubectl-action@v1
+  with:
+    base64-kube-config: ${{ secrets.KUBE_CONFIG }}
+    kubectl-version: v1.22.0
+```
+
+Once you've completed this setup, you have direct access to the `kubectl` binary and command in the rest of your actions. Here's a full example to give you some inspiration:
+```yaml
+name: Kubectl Action
+
+on:
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: tale/kubectl-action@v1
+      with:
+        base64-kube-config: ${{ secrets.KUBE_CONFIG }}
+    - run: kubectl get pods
+```