Added old files

sources/scripts/timeline.js

@@ -0,0 +1,16 @@
+'use strict'
+
+function Timeline () {
+  this.el = document.createElement('div')
+  this.el.id = 'timeline'
+
+  this.install = function (host) {
+    host.appendChild(this.el)
+  }
+
+  this.add_event = function (message) {
+    this.el.className = ''
+    this.el.style.opacity = '0'
+    setTimeout(() => { this.el.style.opacity = 1; this.el.innerHTML = message }, 100)
+  }
+}