Add tasks for all the new languages

Task/Speech-synthesis/Sidef/speech-synthesis.sidef

@@ -0,0 +1,4 @@
+func text2speech(text, lang='en') {
+    Sys.run("espeak -v #{lang} -w /dev/stdout #{text.escape} | aplay");
+}
+text2speech("This is an example of speech synthesis.");

Task/Speech-synthesis/Swift/speech-synthesis.swift

@@ -0,0 +1,6 @@
+import Foundation
+
+let task = NSTask()
+task.launchPath = "/usr/bin/say"
+task.arguments = ["This is an example of speech synthesis."]
+task.launch()