Use yarn, add eslint, add to Readme

.eslintrc.js

@@ -0,0 +1,19 @@
+module.exports = {
+  env: {
+    browser: true,
+    commonjs: true,
+    es6: true
+  },
+  extends: [
+    'standard'
+  ],
+  globals: {
+    Atomics: 'readonly',
+    SharedArrayBuffer: 'readonly'
+  },
+  parserOptions: {
+    ecmaVersion: 2018
+  },
+  rules: {
+  }
+}

README.md

@@ -7,3 +7,68 @@ The code is uploaded here in the hopes it can be made more secure, more efficien
 If you see a serious safety breach, particularly one involving user data, please submit an issue or - even better - a fix, and I'll upload the updated code to the server as soon as I can. Your support is genuinely appreciated.
 
 sweet has been an extremely uphill learning experience for me - I'm entirely self-taught, and am acutely aware that this code is a mess in need of major editing and potentially re-writing. If you'd like to help out, you can find some planned and in-progress work on the [Trello](https://trello.com/b/wzCmHAqi/sweet-development) and more current stuff on the incomplete [functional specification](https://docs.google.com/document/d/1R6jw7jHLAzM-PkLaNzbyalOqKVmUIEzNyhNHpMMlj10/edit?usp=sharing) - get in touch, because I'd love your help.
+
+## Running in local dev
+
+Install mongodb however you prefer. On OS X with Homebrew, that's:
+
+```
+brew install mongodb-community
+brew services start mongodb-community
+```
+
+Then run `yarn` to install dependencies, then `yarn start` to start the server. Go to `http://localhost:8686` to see it running!
+
+If you do anything that triggers an email, it won't get sent for real in local dev, it'll just get output into your console.
+
+You need to prepopulate the users collection with Sweetbot to let logins work. Something like:
+
+```
+db.users.insert({
+  _id: ObjectId("5c962bccf0b0d14286e99b68"),
+  joined: Date.now(),
+  lastOnline: Date.now(),
+  lastUpdated: Date.now(),
+  isVerified: false,
+  verificationToken: '',
+  verificationTokenExpiry: Date.now(),
+  email: '[email protected]',
+  username: 'sweetbot',
+  password: 'invalid password hash',
+  passwordResetToken: '',
+  passwordResetTokenExpiry: Date.now(),
+  image: '',
+  imageEnabled: false,
+  displayName: 'SweetBot',
+  pronouns: 'bot/bot',
+  aboutRaw: '',
+  aboutParsed: '',
+  websiteRaw: '',
+  websiteParsed: '',
+  location: '',
+  notifications: [],
+  pushNotifSubscriptions: [],
+  communities: [],
+  bannedCommunities: [],
+  mutedCommunities: [],
+  hiddenRecommendedUsers: [],
+  hiddenRecommendedCommunities: [],
+  settings: {
+    timezone: "auto",
+    autoDetectedTimeZone: "",
+    profileVisibility: "invisible",
+    newPostPrivacy: "public",
+    imageQuality: "standard",
+    homeTagTimelineSorting: "fluid",
+    userTimelineSorting: "chronological",
+    communityTimelineSorting: "fluid",
+    flashRecentComments: true,
+    digestEmailFrequency: "off",
+    emailTime: "17:00",
+    emailDay: "Sunday",
+    showRecommendations: true,
+    showHashtags: true,
+    sendMentionEmails: true,
+  }
+})
+```