docs: add paperless doc

Signed-off-by: Felix Breuer <fbreuer@pm.me>

README.md

@@ -3,6 +3,61 @@
 ```bash
 helm repo add breuerfelix https://breuerfelix.github.io/helm-charts
 helm repo update
+```
+
+## paperless-ngx
+
+You need to create a secret manually (create namespace first):
+```yaml
+apiVersion: v1
+kind: Secret
+metadata:
+  name: paperless-ngx
+  namespace: paperless-ngx
+type: Opaque
+stringData:
+  PAPERLESS_SECRET_KEY: "some-secret-key"
+  PAPERLESS_URL: "https://paperless.example.com"
+  PAPERLESS_ALLOWED_HOSTS: "https://paperless.example.com"
+  PAPERLESS_ADMIN_USER: "admin"
+  PAPERLESS_ADMIN_PASSWORD: "some-secret-password"
+```
+
+Use the following `values.yaml`:
+
+```yaml
+paperless:
+  image:
+    name: ghcr.io/paperless-ngx/paperless-ngx
+    tag: 2.6.3 # search for the newest version online
 
-helm install paperless-ngx breuerfelix/paperless-ngx -n paperless-ngx
+  ingress:
+    enabled: true
+    host: paperless.example.com
+
+  env:
+    - name: PAPERLESS_REDIS
+      value: redis://redis:80
+    - name: PAPERLESS_TIME_ZONE
+      value: Europe/Berlin # your timezone
+    - name: PAPERLESS_OCR_LANGUAGE
+      value: deu # your language
+
+  secretRefs:
+    - key: PAPERLESS_SECRET_KEY
+      name: paperless-ngx
+    - key: PAPERLESS_URL
+      name: paperless-ngx
+    - key: PAPERLESS_ALLOWED_HOSTS
+      name: paperless-ngx
+    - key: PAPERLESS_ADMIN_USER
+      name: paperless-ngx
+    - key: PAPERLESS_ADMIN_PASSWORD
+      name: paperless-ngx
+```
+
+Install:
+```bash
+kubectl create namespace paperless-ngx
+helm install -f values.yaml -n paperless-ngx paperless-ngx breuerfelix/paperless-ngx
 ```