Add multilingual Agila learning examples and Git practice guide

en/flying-v-ui-contracts/README.md

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+# A beginner study-card description
+
+Use the supplied widget types to describe a study card. Separate the verified sandbox output from your sketch of future interactive behavior.
+
+- Compose a Column using Text and Button children.
+- Predict and check child counts for one, two, and three children.
+- Preview an individual Text and Button and explain their descriptions.
+- Choose understandable text and record feedback from a reader.
+- List intended interactions separately and explain why the current Button does not implement a callback.

en/flying-v-ui-contracts/main.fv

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+import agila
+
+fn main() {
+    view := agila.Column{
+        children: [
+            agila.Text{value: 'Today: understand one function'},
+            agila.Button{label: 'Begin practice'},
+        ]
+    }
+    agila.preview(view)
+}