Start writing the web app

Signed-off-by: Nikolai Rodionov <allanger@posteo.com>

lib/core/api/v1/refresh_session.dart

@@ -0,0 +1,28 @@
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:grpc/grpc_web.dart';
+import 'package:softplayer_dart_proto/accounts/v1/accounts_v1.pbgrpc.dart';
+import 'package:softplayer_web/core/grpc/grpc_client.dart';
+
+final refreshSessionGrpcProvider = Provider<RefreshSessionGrpcRepository>((
+  ref,
+) {
+  return RefreshSessionGrpcRepository(
+    ref.watch(refreshSessionServiceClientProvider),
+  );
+});
+
+class RefreshSessionGrpcRepository {
+  final RefreshSessionServiceClient _client;
+  RefreshSessionGrpcRepository(this._client);
+
+  ResponseFuture<RefreshSessionResponse> refreshSession(String refreshToken) {
+    try {
+      final response = _client.refreshSession(
+        RefreshSessionRequest(refreshToken: refreshToken),
+      );
+      return response;
+    } catch (error) {
+      rethrow;
+    }
+  }
+}