Add multilingual Agila learning examples and Git practice guide

en/ada-first-program/README.md

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+# My explainable study announcement
+
+Write a short Ada program that announces a study goal and conditionally prints a progress message. Submit the source, your predictions, and actual results for your self-review.
+
+- Explain with, the declaration, begin/end, :=, and = in your own words.
+- Show one starting value that prints the conditional message and one that does not.
+- Record one deliberate syntax mistake and how the compiler helped locate it.
+- Credit any AI assistance and explain every retained line.