add eslint example

.gitignore

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+node_modules/

eslint-example/.eslintrc.json

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+{
+    "plugins": [
+        "mozilla"
+    ],
+    "extends": [
+        "eslint:recommended",
+        "plugin:mozilla"
+    ],
+    "rules": {
+        "no-set-state": "off"
+    }
+}

eslint-example/file.js

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+function getJSON(url, callback) {
+    var one, two
+
+
+    let xhr = new XMLHttpRequest();
+    xhr.onload = function() {
+        callback(this.responseText);
+    };
+    xhr.open("GET", url, true);
+    xhr.send();
+}
+
+export function getUsefulContents(url, callback) {
+    getJSON(url, data => callback(JSON.parse(data)));
+}

eslint-example/main.js

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+ import {
+     getUsefulContents
+ } from "file";
+
+ getUsefulContents("http://www.example.com", data => {
+     doSomethingUseful(data);
+ });

eslint-example/package.json

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+{
+  "name": "eslint-example",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "dependencies": {},
+  "devDependencies": {
+    "eslint": "^3.9.0",
+    "eslint-plugin-mozilla": "^0.2.3"
+  },
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC"
+}