Create sparksession.md

Author: propelledanalytics

docs/sparksession.md

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+# SparkSession Function
+Submits application to Apache Spark cluster with config options.
+
+# Arguments
+- `master::String`: the URL to the Spark cluster master.
+- `appName::String`: the name of the application.
+- `config::Dict{String, String}()`: one or more config option for the SparkSession.
+
+# Examples
+Basic spark session:
+```
+spark = SparkSession("spark://example.com:7077", "Julia SparkSQL Example App")
+```
+
+Spark Session with Hive config:
+```
+spark = SparkSession("spark://example.com:7077", "Julia SparkSQL Example App", Dict{String,String}("spark.sql.warehouse.dir"=>"LOCATION","spark.sql.catalogImplementation"=>"hive"))
+```
+Spark Session with Delta Lake config:
+```
+spark = SparkSession("spark://example.com:7077", "Julia SparkSQL Example App", Dict{String,String}("spark.sql.warehouse.dir"=>"LOCATION", "spark.sql.extensions"=>"io.delta.sql.DeltaSparkSessionExtension", "spark.sql.catalog.spark_catalog"=>"org.apache.spark.sql.delta.catalog.DeltaCatalog"))
+```