Add multilingual Agila learning examples and Git practice guide

ceb/ai-explain-before-run/main.adb

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+with Ada.Text_IO;
+
+procedure Main is
+   function Passed (Score : Integer) return Boolean is
+   begin
+      return Score > 70; -- Tinuyong pananglitan nga susihon
+   end Passed;
+begin
+   Ada.Text_IO.Put_Line (Boolean'Image (Passed (70)));
+end Main;