added delete snippet, update snippet, create snippet and save on snippet change

browser/main/lib/dataApi/createSnippet.js

@@ -0,0 +1,23 @@
+const { remote } = require('electron')
+import fs from 'fs'
+import path from 'path'
+import crypto from 'crypto'
+import consts from 'browser/lib/consts'
+
+function createSnippet(snippets) {
+  return new Promise((resolve, reject) => {
+    const newSnippet = { 
+      id: crypto.randomBytes(16).toString('hex'), 
+      name: 'Unnamed snippet',
+      prefix: [],
+      content: ''
+    }
+    snippets.push(newSnippet)
+    fs.writeFile(consts.SNIPPET_FILE, JSON.stringify(snippets, null, 4), (err) => {
+      if (err) reject(err)
+      resolve(snippets)
+    })
+  })
+}
+
+module.exports = createSnippet