Add usb-serial network interface skeleton-code and update README.md

Author: junghyun397

README.md

@@ -9,18 +9,19 @@
 # Main Features
 
 - Supports **all games** that support joystick input
+- Support **WIFI**, **USB Serial**(WIP), **Bluetooth**(WIP) for connecting Mobile App with Device Server
 - Places and **customize** components to [configure panels](https://github.com/junghyun397/VirtualThrottle/wiki/HELP:-how-to-place-and-modify-components-to-build-panel#eng-help-how-to-place-and-modify-components-to-build-panel)
 - Provides 5 components
   - [Slider](https://github.com/junghyun397/VirtualThrottle/wiki/HELP:-how-to-place-and-modify-components-to-build-panel#slider)
   - [Button](https://github.com/junghyun397/VirtualThrottle/wiki/HELP:-how-to-place-and-modify-components-to-build-panel#button)
   - [Toggle Button](https://github.com/junghyun397/VirtualThrottle/wiki/HELP:-how-to-place-and-modify-components-to-build-panel#toggle-button)
   - [Toggle Switch](https://github.com/junghyun397/VirtualThrottle/wiki/HELP:-how-to-place-and-modify-components-to-build-panel#toggle-switch)
   - [Hat Switch](https://github.com/junghyun397/VirtualThrottle/wiki/HELP:-how-to-place-and-modify-components-to-build-panel#hat-switch)
-- **Simple** usage and manuals
+- **Simple** usage and [manual](https://github.com/junghyun397/VirtualThrottle/wiki)
 
 # Install VFT
 
-Currently, this project only support Android and Windows. Please download the app from the [release page](https://github.com/junghyun397/VirtualThrottle/releases) or [Google Play](http://cloud.do1ph.in). A complete installation course [tutorial](https://github.com/junghyun397/VirtualThrottle/wiki/STEP-BY-STEP:-how-to-install-VFT-Flight-Throttle) is available.
+Currently, this project only support Android and Windows. Please download the Mobile App from the [release page](https://github.com/junghyun397/VirtualThrottle/releases) or [Google Play](http://cloud.do1ph.in) and [download]((https://github.com/junghyun397/VirtualThrottle/releases)) and execution Device Server. A complete installation course [tutorial](https://github.com/junghyun397/VirtualThrottle/wiki/STEP-BY-STEP:-how-to-install-VFT-Flight-Throttle) is available.
 
 # Build and Run with flutter
 ```sh

lib/data/data_settings.dart

@@ -50,7 +50,7 @@ class IntegerSettingData extends SettingData<int> {
   void setValue(String sourceString) => value = int.parse(sourceString);
 }
 
-enum NetworkType {WIFI, BLUETOOTH}
+enum NetworkType {WIFI, BLUETOOTH, USB_SERIAL}
 class NetworkTypeSettingData extends SettingData<NetworkType> {
   NetworkTypeSettingData({NetworkType defaultValue, String Function(BuildContext) getL10nName, String Function(BuildContext) getL10nDescription}) : 
         super(defaultValue: defaultValue, getL10nName: getL10nName, getL10nDescription: getL10nDescription);

lib/network/interface/network_usb_serial.dart

@@ -0,0 +1,31 @@
+import 'package:VirtualFlightThrottle/network/interface/network_interface.dart';
+
+class USBSerialNetworkAgent extends NetworkAgent {
+
+  USBSerialNetworkAgent(String address, Function onSessionKilled): super(address, onSessionKilled);
+
+  @override
+  void sendData(NetworkData networkData) {}
+
+  @override
+  void removeConnection() {}
+}
+
+class USBSerialNetworkManager extends NetworkManager {
+
+  @override
+  Future<bool> checkInterfaceAlive() async => Future<bool>.value(false);
+
+  @override
+  Future<String> getLocalAddress() async => Future<String>.value("None");
+
+  @override
+  Future<List<String>> findAliveTargetList() async {return Future.value([]);}
+
+  @override
+  Future<void> connectToTarget(String targetAddress, Function() onSessionLost) async {return Future.value();}
+
+  @override
+  String toString() => "USB";
+
+}

lib/network/network_manager.dart

@@ -2,10 +2,10 @@ import 'package:VirtualFlightThrottle/data/data_settings.dart';
 import 'package:VirtualFlightThrottle/data/data_sqlite3_helper.dart';
 import 'package:VirtualFlightThrottle/network/interface/network_bluetooth.dart';
 import 'package:VirtualFlightThrottle/network/interface/network_interface.dart';
+import 'package:VirtualFlightThrottle/network/interface/network_usb_serial.dart';
 import 'package:VirtualFlightThrottle/network/interface/network_wifi.dart';
 import 'package:VirtualFlightThrottle/utility/utility_system.dart';
 import 'package:flutter/material.dart';
-import 'package:fluttertoast/fluttertoast.dart';
 
 class AppNetworkManager {
 
@@ -18,11 +18,13 @@ class AppNetworkManager {
   static NetworkManager _getNetworkManager() {
     switch (AppSettings().settingsMap[SettingsType.NETWORK_TYPE].value) {
       case NetworkType.WIFI:
-        return new WifiNetworkManager();
+        return WifiNetworkManager();
       case NetworkType.BLUETOOTH:
-        return new BlueToothNetworkManager();
+        return BlueToothNetworkManager();
+      case NetworkType.USB_SERIAL:
+        return USBSerialNetworkManager();
       default:
-        return new WifiNetworkManager();
+        return WifiNetworkManager();
     }
   }