Add multilingual Agila learning examples and Git practice guide

en/ai-tests-and-debugging/main.adb

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+pragma Assertion_Policy (Check);
+with Ada.Text_IO;
+
+procedure Main is
+   function Passed (Score : Integer) return Boolean is
+   begin
+      return Score >= 70;
+   end Passed;
+begin
+   pragma Assert (not Passed (69));
+   pragma Assert (Passed (70));
+   pragma Assert (Passed (71));
+   Ada.Text_IO.Put_Line ("Threshold checks passed");
+end Main;