Add multilingual Agila learning examples and Git practice guide

en/ai-tests-and-debugging/README.md

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+# A small bug report with reproducible evidence
+
+Turn the threshold defect into a concise bug report and repair. Include independent expected results, a regression test, and a clearly stated limit.
+
+- State a requirement and derive expectations before running.
+- Show the smallest input that reveals the original mismatch.
+- Demonstrate that the test fails for the defect and passes after the repair.
+- Record the assertion policy and compiler command.
+- Explain one untested requirement and propose the next relevant case.