React sample apps: useEffect hook, Axios api calls

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+# useEffect Hook
+
+## Code template
+
+import { useEffect } from 'react';
+
+useEffect(() => {
+  // 1. Your side effect code goes here
+  
+  return () => {
+    // 2. Optional cleanup code goes here
+  };
+}, [dependencies]); // 3. Optional dependency array
+
+## Examples
+
+Look at the src/App.jsx file.
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