Added docs for new widgets

lib/src/App.dart

@@ -11,6 +11,8 @@ class App extends StatelessWidget {
       //home: Text('Start'),
       onGenerateRoute: routes,
       theme: ThemeData(
+        // Accent color is set to be used by the floating action button.
+        accentColor: Color(0xFF707070),
         canvasColor: Color.fromRGBO(23, 25, 29, 1.0),
         cardColor: Color.fromRGBO(36, 39, 44, 1.0),
         fontFamily: 'IBM Plex Sans',

lib/src/widgets/new-item-dialog-button.dart

@@ -1,6 +1,10 @@
 import 'package:flutter/material.dart';
 import 'package:font_awesome_flutter/font_awesome_flutter.dart';
 
+/// A card with a label and circular button.
+///
+/// Let's you specify the text shown and the action to perform when the circular
+/// button is pressed.
 class NewItemDialogButton extends StatelessWidget {
   final VoidCallback onTap;
   final String label;
@@ -35,7 +39,6 @@ class NewItemDialogButton extends StatelessWidget {
           ),
           FloatingActionButton(
             child: Icon(FontAwesomeIcons.plus),
-            backgroundColor: Color(0xFF707070),
             onPressed: () {},
           ),
         ],

lib/src/widgets/new-item-dialog-route.dart

@@ -3,6 +3,8 @@ import 'package:flutter/cupertino.dart';
 
 import './new-item-dialog-button.dart';
 
+/// A transparent screen that lets you choose between creating a new task or
+/// add a new picture.
 class NewItemDialogRoute extends PopupRoute {
   @override
   // TODO: implement barrierColor
@@ -19,8 +21,7 @@ class NewItemDialogRoute extends PopupRoute {
   @override
   Widget buildPage(BuildContext context, Animation<double> animation,
       Animation<double> secondaryAnimation) {
-    final result = _builder(context);
-    return result;
+    return _builder(context);
   }
 
   Widget _builder(BuildContext context) {

lib/src/widgets/search-box.dart

@@ -3,6 +3,7 @@ import 'package:font_awesome_flutter/font_awesome_flutter.dart';
 
 import './gradient_touchable_container.dart';
 
+//TODO: Add neccessary properties to be able to inform of changes in text field.
 class SearchBox extends StatelessWidget {
   final double height;