adds express endpoint for addAccess

lib/expressapp.js

@@ -140,6 +140,14 @@ ExpressApp.prototype.start = function(opts, cb) {
     });
   });
 
+  router.put('/v1/copayers/', function(req, res) {
+    var server = getServer(req, res);
+    server.addAccess(req.body, function(err, result) {
+      if (err) return returnError(err, res, req);
+      res.json(result);
+    });
+  });
+
   router.post('/v1/wallets/:id/copayers/', function(req, res) {
     req.body.walletId = req.params['id'];
     var server = getServer(req, res);