Add project files.

Nutrition/formAddNutrition.xaml.cs

@@ -0,0 +1,50 @@
+using System.Windows;
+using Npgsql;
+
+namespace SportsTrainingApp.Nutrition
+{
+    /// <summary>
+    /// Interaction logic for formAddNutrition.xaml
+    /// </summary>
+    public partial class formAddNutrition : Window
+    {
+        int user_id = -1;
+        public formAddNutrition(int _user_id)
+        {
+            InitializeComponent();
+            user_id = _user_id;
+            dtPicker.SelectedDate = DateTime.Now;
+        }
+
+        private void AddNutrition()
+        {
+            using (var conn = new NpgsqlConnection(formMain.connectionString))
+            {
+                conn.Open();
+                using (var cmd = new NpgsqlCommand($@"INSERT INTO dbo.nutrition(
+	                                                user_id, date, calories, protein, carbs, fats)
+	                                                VALUES (@user_id, @date, @calories, @protein, @carbs, @fats);", conn))
+                {
+                    cmd.Parameters.AddWithValue("user_id", user_id);
+                    cmd.Parameters.AddWithValue("date", dtPicker.SelectedDate.Value);
+                    cmd.Parameters.AddWithValue("calories", Convert.ToInt32(tbCalories.Text));
+                    cmd.Parameters.AddWithValue("protein", Convert.ToDouble(tbProtein.Text));
+                    cmd.Parameters.AddWithValue("carbs", Convert.ToDouble(tbCarbs.Text));
+                    cmd.Parameters.AddWithValue("fats", Convert.ToDouble(tbFats.Text));
+                    cmd.ExecuteNonQuery();
+                }
+                this.Close();
+            }
+        }
+
+        private void Button_Click_1(object sender, RoutedEventArgs e)
+        {
+            AddNutrition();
+        }
+
+        private void Button_Click_2(object sender, RoutedEventArgs e)
+        {
+            this.Close();
+        }
+    }
+}