Add offset snippet

snippets/offset.md

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+### offset
+
+Moves the specified amount of elements to the end of the array.
+
+Use `Array.slice()` twice to get the elements after the specified index and the elements before that.
+Use the spread operator(`...`) to combine the two into one array.
+If `offset` is negative, the elements will be moved from end to start.
+
+```js
+const offset = (arr, offset) => [...arr.slice(offset), ...arr.slice(0, offset)];
+```
+
+```js
+offset([1, 2, 3, 4, 5], 2); // [3, 4, 5, 1, 2]
+offset([1, 2, 3, 4, 5], -2); // [4, 5, 1, 2, 3]
+```