Add Documentation in Markdown plus express middleware for in-site rendering.

res/app/docs/docs-controller.js

@@ -0,0 +1,19 @@
+module.exports = function DocsCtrl($rootScope, $scope, $window, $location) {
+
+  $scope.goBack = function () {
+    $window.history.back()
+  }
+
+  $scope.goHome = function () {
+    $location.path('/docs/en/index')
+  }
+
+  $rootScope.$on("$routeChangeError",
+    function (event, current, previous, rejection) {
+      console.log("ROUTE CHANGE ERROR: " + rejection)
+      console.log('event', event)
+      console.log('current', current)
+      console.log('previous', previous)
+
+    })
+}