added K8s-Deployment and edited README

kubernetes/README.md

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+# Uptime-Kuma K8s Deployment
+## How does it work?
+
+Kustomize is a tool which builds a complete deployment file for all config elements.
+You can edit the files in the ```uptime-kuma``` folder except the ```kustomization.yml``` until you know what you're doing.
+
+It creates a certificate with the specified Issuer and creates the Ingress for the Uptime-Kuma ClusterIP-Service
+
+## What do i have to edit?
+You have to edit the ```ingressroute.yml``` to your needs.
+This ingressroute.yml is for the [nginx-ingress-controller](https://kubernetes.github.io/ingress-nginx/) in combination with the [cert-manager](https://cert-manager.io/).
+
+- host
+- secrets and secret names
+- (Cluster)Issuer (optional)
+- the Version in the Deployment-File
+  - update:
+    - change to newer version and run the above commands, it will update the pods one after another
+
+## How To use:
+
+- install [kustomize](https://kubectl.docs.kubernetes.io/installation/kustomize/)
+- Edit files mentioned above to your needs
+- run ```kustomize build > apply.yml```
+- run ```kubectl apply -f apply.yml```
+
+Now you should see some k8s magic and Uptime-Kuma should be available at the specified address.