Update templates

snippets/js/snippet-template.md

@@ -0,0 +1,23 @@
+---
+title: Function name
+type: snippet
+language: javascript
+tags: [array]
+cover: image
+dateModified: 2021-06-13T05:00:00-04:00
+---
+
+Explain briefly what the snippet does.
+
+- Explain briefly how the snippet works.
+- Use bullet points for your snippet's explanation.
+- Try to explain everything briefly but clearly.
+
+```js
+const functionName = arguments =>
+  {functionBody}
+```
+
+```js
+functionName('sampleInput'); // 'sampleOutput'
+```