added documentation for databricks connection "wait for cluster" feature

docs/connection-options.md

@@ -0,0 +1,29 @@
+# Connection Options
+
+When connecting to a Databricks cluster, it might be that the cluster is in the starting state so I have added some code to sit and poll the spark server until the cluster is available.
+
+There are two options that help configure this and I added the options to the `SparkSessionBuilder`.
+
+## DatabricksWaitForClusterMaxTime
+
+This controls how long we will sit and wait for the cluster to start:
+
+```csharp
+var spark = 
+        SparkSession
+        .Builder
+        .DatabricksWaitForClusterMaxTime(5)
+        .GetOrCreate();
+```
+
+## DatabricksWaitForClusterOnSessionCreate
+
+The second option disables the behaviour completely:
+
+```csharp
+var spark = 
+        SparkSession
+        .Builder
+        .DatabricksWaitForClusterOnSessionCreate(false)
+        .GetOrCreate();
+```