Add multilingual Agila learning examples and Git practice guide

en/flying-v-first-program/README.md

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+# A three-step study log
+
+Write a Flying V program that logs the beginning, goal, and end of a study session using the documented SDK function.
+
+- Use agila.log and identify its definition in the public SDK.
+- Predict exact output, including the SDK prefix, before execution.
+- Explain import, main, the string argument, and statement order.
+- Record one misspelled-function diagnostic and the repair.
+- Submit source and output for your self-review with the toolchain version.