Add Spread The Rest With ES6 as a javascript til

javascript/spread-the-rest-with-es6.md

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+# Spread The Rest With ES6
+
+The spread operator provided by ES6 is a powerful syntactic feature. One way
+it can be used is to capture the _rest_ of an object or array in a variable.
+
+```javascript
+const pokemon = ["Charmander", "Squirtle", "Bulbasaur"];
+const [first, ...rest] = pokemon;
+
+console.log("Remaining: ", rest); // Remaining: ["Squirtle", "Bulbasaur"]
+
+const gymLeaders = {
+  brock: "rock",
+  misty: "water",
+  surge: "electric",
+  erika: "rainbow"
+};
+let { brock, erika, ...otherLeaders } = gymLeaders;
+
+console.log(otherLeaders); // Object {misty: "water", surge: "electric"}
+```
+
+Using this spread destructuring we can capture the remaining parts of an
+array or object in a variable. We can also use this syntax in a function
+signature to grab specific items from an incoming object argument without
+losing track of the rest -- this is especially useful in React.js
+development when dealing with incoming props.
+
+See a [live example here](https://codesandbox.io/s/ov2xr1o12y).