Add configuration for one-broker execution

Closes #38

execution/helm/README.md

@@ -17,6 +17,10 @@ Dependencies and sub charts:
 - kafka-client
 - zookeeper
 
+## Configuration
+
+In development environments Kubernetes resources are often low.  To reduce resource consumption, we provide an `one broker-value.yaml` file. This file can be used with `helm install theodolite <path-to-chart> -f one-broker-values.yaml`.
+
 ## Development
 
 ### Sub charts

execution/helm/one-broker-values.yaml

+cp-helm-charts:
+    ## ------------------------------------------------------
+    ## Zookeeper
+    ## ------------------------------------------------------
+    cp-zookeeper:
+      servers: 1 # default: 3 
+
+  ## ------------------------------------------------------
+  ## Kafka
+  ## ------------------------------------------------------
+    cp-kafka:
+        brokers: 1 # deauflt: 10
+
+        configurationOverrides:
+          offsets.topic.replication.factor: "1"
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