Add multilingual Agila learning examples and Git practice guide

en/flying-v-lifecycle/README.md

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+# A lifecycle lab with expected failures
+
+Build a small application and a set of isolated lifecycle experiments. Explain which errors the SDK detects and what your application does next.
+
+- Show a normal create/start/request/stop sequence.
+- Test empty id and empty name independently.
+- Test request-before-start and double-start independently.
+- Explain the difference between an error handler that returns and one that continues.
+- Record source, output, and the limitations of sandbox capability checks for review.

en/flying-v-lifecycle/main.fv

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+import agila
+
+fn main() {
+    mut app := agila.new_app('dev.student.study', 'Study Buddy') or {
+        eprintln(err.msg())
+        return
+    }
+    app.start() or {
+        eprintln(err.msg())
+        return
+    }
+    app.request(.ui) or { eprintln(err.msg()) }
+    agila.log('Ready to study')
+    app.stop()
+}