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.

en/ada-first-program/main.adb

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+with Ada.Text_IO;
+
+procedure Main is
+   Lessons_Done : Natural := 0;
+begin
+   Ada.Text_IO.Put_Line ("My first Agila study session");
+   Lessons_Done := Lessons_Done + 1;
+   if Lessons_Done = 1 then
+      Ada.Text_IO.Put_Line ("One lesson completed");
+   end if;
+end Main;