Add quickstart guide

docs/quickstart.md

+---
+title: Getting Started
+has_children: false
+nav_order: 1
+---
+
+# Getting Started
+
+All you need to get started is access to a Kubernetes cluster plus kubectl and Helm installed on your machine.
+
+<!--### Installation-->
+
+1. To install Theodolite with all its dependencies run:
+
+    ```sh
+    helm repo add theodolite https://cau-se.github.io/theodolite
+    helm repo update
+    helm install theodolite theodolite/theodolite
+    ```
+
+1. Get the Theodolite examples from the [Theodolite repository](https://github.com/cau-se/theodolite) and `cd` into its example directory:
+
+    ```sh
+    git clone https://github.com/cau-se/theodolite.git
+    cd theodolite/theodolite/examples/
+    ```
+
+1. Deploy the example Benchmark and package its associated Kubernetes resources in a ConfigMap:
+
+    ```sh
+    kubectl apply -f operator/example-benchmark.yaml
+    kubectl create configmap benchmark-resources-custom --from-file=./resources -o yaml --dry-run=client | kubectl apply -f -
+    ```
+
+1. Verify that the Benchmark has been deployed successfully:
+
+    ```sh
+    kubectl get benchmarks
+    ```
+
+    The output is similar to this:
+
+    ```
+    NAME           AGE
+    uc1-kstreams   100s
+    ```
+
+    <!-- State with newest version -->
+
+1. Run the Benchmark by deploying an Execution:
+
+    ```sh
+    kubectl apply -f operator/example-execution.yaml 
+    ```
+
+1. Verify that the Executions is running:
+
+    ```sh
+    kubectl get executions
+    ```
+
+    The output is similar to this:
+
+    ```
+    NAME                           STATUS    DURATION   AGE
+    theodolite-example-execution   RUNNING   13s        14s
+    ```
+
+    You can get additional information about the current status of an Execution by running:
+    Theodolite provides additional information on the current status of an Execution by producing Kubernetes events. To see them:
+
+    ```sh
+    kubectl describe execution theodolite-example-execution
+    ```
+
+<!--
+## Next Steps
+
+* Deploy and run custom benchmarks
+* Define your own benchmarks
+* Customize the benchmark
+
+## Further Readings
+
+* Customize the Theodolite Installation
+-->