initial commit

App.config

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+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+
+</configuration>

LoginForm.cs

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+using OpenVkNetApi;
+using System.Configuration;
+
+namespace Spotify2OVK
+{
+    public partial class LoginForm : Form
+    {
+        private OVkApi api = new();
+        private Configuration config;
+        private AppSettingsSection app;
+        public LoginForm()
+        {
+            InitializeComponent();
+            MaximizeBox = false;
+            config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
+            app = config.AppSettings;
+        }
+
+        private void loginButton_Click(object sender, EventArgs e)
+        {
+            if (!string.IsNullOrEmpty(login.Text) && !string.IsNullOrEmpty(password.Text) && !string.IsNullOrEmpty(instance.Text))
+            {
+                app.Settings.Add("ovkToken", api.Authorization(login.Text, password.Text, instance.Text).access_token);
+                app.Settings.Add("ovkInstance", instance.Text);
+                config.Save(ConfigurationSaveMode.Modified);
+                ToMainForm();
+            }
+            else
+            {
+                MessageBox.Show("Заполните все поля");
+            }
+        }
+        private void ToMainForm() {
+            MainForm form = new();
+            Hide();
+            form.ShowDialog();
+            Close();
+        }
+    }
+}