create firebase setup

relates #66

.firebaserc

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+{
+  "projects": {
+    "default": "stimmy-things-infact"
+  }
+}

database.rules.json

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+{
+  "rules": {
+    ".read": "auth != null",
+    ".write": "auth != null"
+  }
+}

firebase-config.js

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+export function config() {
+  return {
+    apiKey: 'AIzaSyB_MH_CW9Y_79KlOAj476V59sTOisvjRk4',
+    authDomain: 'stimmy-things-infact.firebaseapp.com',
+    databaseURL: 'https://stimmy-things-infact.firebaseio.com',
+    projectId: 'stimmy-things-infact',
+    storageBucket: 'stimmy-things-infact.appspot.com',
+    messagingSenderId: '45676217448'
+  };
+}

firebase.js

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+import firebase from 'firebase/app';
+import 'firebase/database';
+import { config } from './firebase-config.js';
+
+export function initFirebaseDB() {
+  firebase.initializeApp(config());
+  return firebase.database();
+}
+
+export const firebaseDB = initFirebaseDB();
+
+export function addNewStim(db, stim) {
+  return db.stims.push(stim);
+}

firebase.json

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+{
+  "database": {
+    "rules": "database.rules.json"
+  }
+}