implemented frontend including separate message system; started to implement backend

yjs-poll/node_modules/isomorphic.js/iso.js

@@ -0,0 +1,18 @@
+
+const isNode = typeof process !== 'undefined' && process.release && /node|io\.js/.test(process.release.name)
+
+const isoBrowser = require('./browser.js')
+
+const perf = isNode ? require('perf_hooks').performance : isoBrowser.performance
+const nodeCrypto = isNode ? require('crypto') : null
+
+/**
+ * @type {function(number):ArrayBuffer}
+ */
+const cryptoRandomBuffer = nodeCrypto
+  // node
+  ? len => nodeCrypto.randomBytes(len).buffer
+  : isoBrowser.cryptoRandomBuffer
+
+exports.performance = perf
+exports.cryptoRandomBuffer = cryptoRandomBuffer