Added select server screen and add server screen

lib/models/server.dart

@@ -0,0 +1,21 @@
+class Server {
+  final String name;
+  final String connectionMethod;
+  final String domain;
+  final String? path;
+  final int? port;
+  final String user;
+  final String password;
+  final bool defaultServer;
+
+  const Server({
+    required this.name,
+    required this.connectionMethod,
+    required this.domain,
+    this.path,
+    this.port,
+    required this.user,
+    required this.password,
+    required this.defaultServer
+  });
+}