[SPARK-51991] Add GettingStarted.md and SparkSession.md

Author: dongjoon-hyun

.spi.yml

@@ -15,3 +15,6 @@
 version: 1
 metadata:
   authors: "Apache Spark project"
+builder:
+  configs:
+    - documentation_targets: [SparkConnect]

Package.swift

@@ -47,6 +47,9 @@ let package = Package(
         .product(name: "GRPCProtobuf", package: "grpc-swift-protobuf"),
         .product(name: "GRPCNIOTransportHTTP2", package: "grpc-swift-nio-transport"),
         .product(name: "FlatBuffers", package: "flatbuffers"),
+      ],
+      resources: [
+        .process("Documentation.docc")
       ]
     ),
     .executableTarget(