docs: add information to README.md

README.md

@@ -1,3 +1,100 @@
 # Modelix Kubernetes
 
-This repository contains the Helm Charts for [Modelix Workspaces](https://github.com/modelix/modelix.workspaces).
+Helm chart
+and supporting OCI images to run [Modelix Workspaces](https://github.com/modelix/modelix.workspaces) in Kubernetes.
+
+## Deploying Modelix Workspaces
+
+You can deploy the [published Helm chart](https://artifacts.itemis.cloud/repository/helm-modelix/) like this:
+```shell
+helm install --repo https://artifacts.itemis.cloud/repository/helm-modelix/ dev modelix
+```
+
+> [!TIP]
+> Locally you can run a Kubernetes Cluster (among other options) with Docker Desktop.
+> 
+> When doing so, you change the memory limit to 8 GB or more _Resources_.
+>
+> Also, if you use Docker Desktop >= 4.2.0 you have to add the option `"deprecatedCgroupv1": true`
+to the file `~/Library/Group Containers/group.com.docker/settings.json`.
+Otherwise, MPS (the JBR) will not use the correct memory limit.
+
+> [!TIP]
+> Helm allows you to deploy multiple instances of modelix to the same cluster.
+> You could have one instance for testing and one production instance. 
+> Just specify a different instance name and hostname when running helm:
+>   * `helm install --repo https://artifacts.itemis.cloud/repository/helm-modelix/ xyz modelix --set ingress.hostname=xyz.127.0.0.1.nip.io`
+>     * "xyz" is the name of your modelix instance.
+>     * "xyz.127.0.0.1.nip.io" is the hostname used to access the modelix instance. In a development environment you can use nip.io to get different hostnames that resolve to 127.0.0.1.
+
+
+## Developing Modelix Workspaces
+
+This Helm chart is tightly coupled and has to be developed in together with [Modelix Workspace components](https://github.com/modelix/modelix.workspaces).
+
+### Making changes to the Helm chart and OCI images in this repository
+
+1. Set up the project by running:
+   ```shell
+   ./gradlew
+   ```
+2. Build your changes by running:
+   ```shell
+   ./gradlew build
+   ```
+3. Build OCI images with Docker by running:
+   ```shell
+   ./docker-build-local-and-publish-on-ci-all.sh
+   ```
+4. Update the versions in the local helm chart with:
+   ```shell
+   ./helm/update-versions.sh
+   ```
+5. Install the Helm chart with the changed images: 
+   ```shell
+   ./helm/install.sh
+   ```
+
+## Additional Configuration
+
+### Admin password
+
+After Modelix is deployed, make sure to change the password of the admin account.
+- Open http://localhost/admin/master/console/#/realms/master/users
+- The default password for the user **admin** is **modelix**.
+- Navigate to Edit > Credentials > Reset Password
+- Enter a new password and disable *Temporary*
+
+### Node Pools
+
+If you are using a cloud provider that supports auto-scaling create a separate node pool for the MPS instances.
+Add a taint "**workspace-client**" with the value "**true**" and the type "**NoExecute**".
+This taint ensures that the pool can be scaled down after Modelix stopped the MPS instances
+and the nodes don't keep running because some other small pod was scheduled to them.
+
+An MPS instances with a lot of languages and plugins can require ~8 GB of memory.
+16 GB of memory for a node is a reasonable size.
+
+### Making changes to [Modelix Workspace components](https://github.com/modelix/modelix.workspaces)
+
+1. Follow the instructions in [Modelix Workspace components](https://github.com/modelix/modelix.workspaces) to build OCI images with local changes. TODO Olekz link sub page
+
+2. Update the `modelixWorkspacesVersion` in [versions.properties](versions.properties) to the version of the locally built images.  
+  You can find out the version in the labels of the newly built images or in the `workspaces-version.txt` in your locally checked out [Modelix Workspace components](https://github.com/modelix/modelix.workspaces)
+  where you build the images in.
+   The versions.properties would the look like:
+   ```properties
+    # Modelix core version.
+    modelixCoreVersion=2.10.5
+    # Modelix Workspaces versions
+    # 0.0.2-9-gb8651c9 is an example for the versions of Workspace components you want to run the Helm chart with.
+    modelixWorkspacesVersion=0.0.2-9-gb8651c9
+   ```
+3. Update the versions in the local helm chart with:
+   ```shell
+   ./helm/update-versions.sh
+   ```
+4. Install the Helm chart with the changed images:
+   ```shell
+   ./helm/install.sh
+   ```