Draft: Docs for standalone mode

This MR contains so far only old docs for standalone mode, which are removed from the base branch.

docs/creating-a-benchmark-old.md

+* Create a benchmark for operator mode
+* Create a benchmark for standalone mode
+* Deploy a benchmark
+
+## Creating a benchmark for operator mode
+
+### App and Workload Generator Resources
+
+### Load and Resource Types
+
+### Kafka Configuration
+
+
+### Make benchmark Kubernetes resources accessible
+
+* A benchmark is defined by a set of Kubernetes resources, which are automatically deployed and scaled by Theodolite.
+* To make these resources accessible by the Theodolite operator, we need to add them to a volume, already mounted by Theodolite. The easiest way to do this is by adding the resources to the ConfigMap `benchmark-resources-custom`, which is mounted by Theodolite with its default installation.
+
+
+
+
+
+## Creating a benchmark for standalone mode
+
+Creating a benchmark in standalone mode is similar to operator mode. However,
+instead of defining a benchmark as `Benchmark` resource, it is defined as a
+benchmark YAML file. Such a file deviates in the following points from a
+`Benchmark` resource:
+
+* The fields `apiVersion`, `kind` and `metadata` should be removed.
+* The benchmark's name (`metadata.name` in `Benchmark` resources) must be defined by the top-level field `name`.
+* Everything that is defined in `spec` has to be moved to the top-level.
+
+**TODO: example**
+
+**TODO: Create a ConfigMap containing the benchmark YAML files as well as all Kubernetes resources for that benchmark + deploy**
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