THRIFT-5621: Add Swift tutorial

Client: swift
diff --git a/tutorial/swift/README.md b/tutorial/swift/README.md
new file mode 100644
index 0000000..18a1e7b
--- /dev/null
+++ b/tutorial/swift/README.md
@@ -0,0 +1,11 @@
+# Thrift Swift Tutorial
+==================================================
+
+## Run the tutorial code (client + server):
+`make tutorial`
+
+## Run the server only
+`make tutorialserver`
+
+## Run the client only
+`make tutorialclient`