make min max average and sum snippets

snippets/min.md

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+### min
+
+Returns the minimum value in an array.
+
+Use `Math.min()` combined with the spread operator (`...`) to get the minimum value in the array.
+
+```js
+const min = arr => Math.min(...[].concat(...arr));
+```
+
+```js
+min([10, 1, 5]); // 1
+```