Add multilingual language and systems learning tracks

en/swift-practice-20261101/README.md

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+# Swift — build and test
+
+[Agila University track](https://edu.agilaos.com/track.php?track=17&lang=en)
+
+About 15 minutes per lesson. Predict, run, change, explain, then complete the check in University.
+
+- [Lesson 1: Collections and repeated work](lesson-1/lesson.html)
+- [Lesson 2: A language feature worth understanding](lesson-2/lesson.html)
+- [Lesson 3: Build, break, and test a study planner](lesson-3/lesson.html)