Add screenshots and docs (#1)

* Fix some warnings

* Add screenshots and docs

README.md

@@ -1,3 +1,18 @@
 # LCN Frontend
 
 This repository contains the frontend files for the Home Assistant LCN configuration panel.
+
+## Features
+
+- Device Configuration
+  ![Device Configuration](./screenshots/lcn_devices.png?raw=true)
+
+  - Set up modules and groups for all your LCN integrations.
+  - Search for modules and groups and have them added automatically.
+  - Select a module or group to access the respective Entity Configuration panel.
+
+- Entity Configuration
+  ![Entity Configuration](./screenshots/lcn_create_entity.png?raw=true)
+  - Set up Home Assistant entities for each module or group.
+  - Create new entities that map the functions of your LCN modules and configure their parameters.
+  - New entities are automatically added to your Home Assistant configuration and you can add them to your dashboards just like for any other integration.

src/localize/languages/en.json

@@ -96,7 +96,7 @@
   "dashboard-devices-dialog-error-module": "Module ID must be 5..254.",
   "dashboard-devices-dialog-error-group": "Group ID must be 5..254.",
 
-  "dashboard-entities-title": "LCN entities",
+  "dashboard-entities-title": "LCN Entities",
   "dashboard-entities-introduction": "Configure the entities for this module / group.",
   "dashboard-entities-introduction-help-1": "Add new entities provided by this module/group to your configuration.",
   "dashboard-entities-introduction-help-2": "Click on \"Create entity\", select the domain and configure the parameters according to your LCN installation.",