chore: update readme

README.md

@@ -1,3 +1,64 @@
-# ExternalDNS - Unifi Webhook
+# ExternalDNS webhook provider for UniFi
 
-There be dragons ...
+⚠️ This software is experimental and **NOT FIT FOR PRODUCTION USE!**
+
+[ExternalDNS](https://github.com/kubernetes-sigs/external-dns) is a Kubernetes add-on for automatically managing DNS records for Kubernetes ingresses and services by using different DNS providers. This webhook allows to manage your UniFi domains inside your Kubernetes cluster.
+
+## Requirements
+
+- ExternalDNS >= v0.14.0
+- UniFi OS >= 4.0.3 (currently Early Access only)
+- UniFi Network >= 8.2.87 (currently Early Access only)
+
+## Deployment
+
+1. Create a local user with a password in your UniFi OS, this user only needs read/write access to the UniFi Network appliance.
+
+2. Add the ExternalDNS Helm repository to your cluster.
+
+    ```shell
+    helm repo add external-dns https://kubernetes-sigs.github.io/external-dns/
+    ```
+
+3. Create the helm values file, for example `external-dns-unifi-values.yaml`:
+
+    ```yaml
+    fullnameOverride: external-dns-unifi
+    logLevel: debug
+    provider:
+      name: webhook
+      webhook:
+        image:
+          repository: ghcr.io/kashalls/external-dns-unifi-webhook
+          tag: main # replace with a versioned release tag
+        env:
+          - name: UNIFI_HOST
+            value: https://192.168.1.1 # replace with the address to your UniFi router
+          - name: SERVER_HOST
+            value: 0.0.0.0
+          - name: UNIFI_USER
+            valueFrom:
+              secretKeyRef:
+                name: external-dns-unifi-secret
+                key: username
+          - name: UNIFI_PASS
+            valueFrom:
+              secretKeyRef:
+                name: external-dns-unifi-secret
+                key: password
+          - name: LOG_LEVEL
+            value: debug
+          - name: UNIFI_SKIP_TLS_VERIFY
+            value: "true"
+    policy: sync
+    sources: ["ingress", "service"]
+    txtOwnerId: default
+    txtPrefix: k8s.
+    domainFilters: ["example.com"] # replace with your domain
+    ```
+
+4. Install the Helm chart
+
+    ```shell
+    helm install external-dns-unifi external-dns/external-dns -f external-dns-unifi-values yaml --version 1.14.3 -n external-dns
+    ```