Add Apache Spark to README

README.md

@@ -169,6 +169,15 @@ This will remove the use of `allOf` but produce a schema which should accept the
 This is only useful for schemas not generated by JSONoid since JSONoid does not currently generate schemas with `allOf`.
 Accordingly, there is no option for this transformer in the CLI, but may be useful via the API.
 
+## Apache Spark :sparkles:
+
+JSONoid also supports distributed schema discovery via [Apache Spark](https://spark.apache.org/).
+There are two options for running JSONoid on Spark.
+The first is to the `JsonoidSpark` class as your main class when running Spark.
+In this case, you can pass a path file path as input and the schema will be written to standard output.
+Alternatively, you can use the `JsonoidRdd#fromString` method to convert an RDD of strings to an RDD of schemas that supports schema discovery via the `reduceSchemas` or `treeReduceSchemas `method.
+The result of the reduction will be a `JsonSchema` object.
+
 ## Running tests
 
 Tests can be run via [ScalaTest](https://www.scalatest.org/) via `sbt test`.