Added module example

.gitignore

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+.idea

exo-recapitulatif/index.html

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+<!doctype html>
+
+<body>
+<script src="script.js" type="module"></script>
+<button id="foo">boom</button>
+</body>

exo-recapitulatif/script.js

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+
+export function toto(){
+    console.log("say toto");
+}
+
+export function hello(){
+    console.log("say hello");
+}
+
+document.querySelector('#foo').addEventListener('click', toto);
+document.querySelector('#foo').addEventListener('click', hello);

modules-examples/stats.js

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+export function average(lst){
+    if(lst.length < 1){
+        return NaN;
+    }
+    let sum = 0;
+    let n = 0;
+    for(const e of lst){
+        sum += e;
+        n += 1;
+    }
+    return sum / n;
+}
+
+
+export function std(lst){
+    if(lst.length < 1){
+        return NaN;
+    }
+    let sum = 0;
+    let sum2 = 0;
+    let n = 0;
+    for(const e of lst){
+        sum += e;
+        sum2 += e * e;
+        n += 1;
+    }
+    return Math.sqrt( sum2 / n - Math.pow(sum / n, 2));
+}