[build] 토이 프로젝트 작업 변경

1. .gitignore 파일이 추가되어, 컴파일된 바이너리, 로그, 임시 파일 등이 Git 추적에서 제외되었습니다.
2. WPF의 MVVM 패턴을 따르는 여러 뷰(LoginWindow.xaml, MainWindow.xaml, RegistMemberWindow.xaml), 뷰 모델(LoginWindowViewModel.cs, MainWindowViewModel.cs, RegistMemberWindowViewModel.cs), 그리고 모델(Member.cs)이 추가되었습니다.
3. 리소스 및 스타일 정의를 포함한 XAML 리소스 파일(DefaultTheme.xaml, LightTheme.xaml, Buttons.xaml 등)이 추가되어 UI의 모양과 느낌을 커스터마이즈할 수 있게 되었습니다.
4. 애플리케이션 설정(AppSettings.cs)과 관련된 설정 파일과 로그인 정보(LoginInfo.cs)를 처리하는 코드가 추가되었습니다.
5. 이미지 리소스(bg_login.jpeg, btn_search_001.png, ico_pw.png, ico_user.png)가 추가되어 UI에 사용됩니다.
6. 유틸리티 및 서비스(ResourceExplorer.cs, ViewModelLocator.cs 등)를 처리하는 여러 보조 클래스들이 추가되었습니다.

src/WPFEduSolution/WPFBeginner/ViewModels/MainWindowViewModel.cs

@@ -0,0 +1,201 @@
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using System.Collections.ObjectModel;
+using System.Windows;
+using System.Windows.Input;
+using WPFBeginner.Models;
+using WPFBeginner.Services;
+using WPFBeginner.Views;
+
+namespace WPFBeginner.ViewModels
+{
+    public partial class MainWindowViewModel : ObservableRecipient
+    {
+        private ObservableCollection<Member> members;
+        public ObservableCollection<Member> Members
+        {
+            get
+            {
+                if(filterMemebers != null)
+                    return filterMemebers;
+
+                return members;
+            }
+            set => SetProperty(ref members, value);
+        }
+
+        private ObservableCollection<Member> filterMemebers;
+
+        [ObservableProperty]
+        private Member selectedMember;
+
+        private Member searchModel;
+
+        public string MemberName
+        {
+            get => searchModel?.Name;
+            set
+            {
+                if (searchModel == null)
+                    searchModel = new Member();
+
+                searchModel.Name = value;
+                OnPropertyChanged();
+            }
+        }
+
+        public string Call
+        {
+            get => searchModel?.Call;
+            set
+            {
+                if (searchModel == null)
+                    searchModel = new Member();
+
+                searchModel.Call = value;
+                OnPropertyChanged();
+            }
+        }
+        public string EmployeeNo
+        {
+            get => searchModel?.EmployeeNo;
+            set
+            {
+                if (searchModel == null)
+                    searchModel = new Member();
+
+                searchModel.EmployeeNo = value;
+                OnPropertyChanged();
+            }
+        }
+
+        public string EMail
+        {
+            get => searchModel.EMail;
+            set
+            {
+                if (searchModel == null)
+                    searchModel = new Member();
+
+                searchModel.EMail = value;
+                OnPropertyChanged();
+            }
+        }
+
+        private bool isKorean;
+        public bool IsKorean
+        {
+            get => isKorean;
+            set
+            {
+                SetProperty(ref isKorean, value);
+                App.Config.Language = value ? "ko-KR" : "en-US";
+            }
+        }
+
+        private bool isDefaultTheme;
+        public bool IsDefaultTheme
+        {
+            get => isDefaultTheme;
+            set
+            {
+                SetProperty(ref isDefaultTheme, value);
+                App.Config.Theme = value ? "DefaultTheme" : "LightTheme";
+            }
+        }
+
+        public ICommand SearchClickCommand => new RelayCommand(() =>
+        {
+            var errorMessage = ValidateSearchValues();
+            if (errorMessage != null)
+            {
+                MessageBox.Show(errorMessage);
+                filterMemebers = null;
+                return;
+            }
+
+
+            IEnumerable<Member> result = Members;    
+
+            if (!string.IsNullOrWhiteSpace(MemberName))
+                result = result.Where(i => i.Name?.Contains(MemberName) ?? false);
+
+            if (!string.IsNullOrWhiteSpace(EMail))
+                result = result.Where(i => i.EMail?.Contains(EMail) ?? false);
+
+            if (!string.IsNullOrWhiteSpace(Call))
+                result = result.Where(i => i.Call?.Contains(Call) ?? false);
+
+            if (!string.IsNullOrWhiteSpace(EmployeeNo))
+                result = result.Where(i => i.EmployeeNo?.Contains(EmployeeNo) ?? false);
+
+            if (result == null)
+                filterMemebers = new ObservableCollection<Member>();
+            else
+                filterMemebers = new ObservableCollection<Member>(result);
+
+            OnPropertyChanged(nameof(Members));
+        });
+
+
+        private string ValidateSearchValues()
+        {
+            if (string.IsNullOrWhiteSpace(MemberName)
+                && string.IsNullOrWhiteSpace(EmployeeNo)
+                && string.IsNullOrWhiteSpace(Call)
+                && string.IsNullOrWhiteSpace(EMail))
+                return ResourceExplorer.GetStringResource("Cultures.MainWindow.ErrorMessage.SearchConditionEmpty");
+
+            return null;
+        }
+
+        public ICommand DeleteClickCommand => new RelayCommand(() =>
+        {
+            if (SelectedMember == null)
+                return;
+
+            Members.Remove(SelectedMember);
+        });
+
+        public ICommand InitClickCommand => new RelayCommand(() =>
+        {
+            filterMemebers = null;
+            searchModel = new Member();
+            OnPropertyChanged(nameof(MemberName));
+            OnPropertyChanged(nameof(EmployeeNo));
+            OnPropertyChanged(nameof(EMail));
+            OnPropertyChanged(nameof(Call));
+            OnPropertyChanged(nameof(Members));
+        });
+
+        public ICommand AddClickCommand => new RelayCommand(() =>
+        {
+            var registDialog = new RegistMemberWindow();
+            var result = registDialog.ShowDialog();
+            if (result == true)
+            {
+                var dx = registDialog.DataContext as RegistMemberWindowViewModel;
+                if (dx == null)
+                    return;
+                Members.Add(Member.Create(dx.MemberName, dx.Call, dx.Email, dx.EmployeeNo));
+            }
+        });
+
+
+        public MainWindowViewModel()
+        {
+            CreateDefaultMember();
+            searchModel = new Member();
+            isKorean = App.Config.Language.Equals("ko-KR", StringComparison.OrdinalIgnoreCase);
+            isDefaultTheme = App.Config.Theme.Equals("DefaultTheme", StringComparison.OrdinalIgnoreCase);
+        }
+
+        private void CreateDefaultMember()
+        {
+            members = new ObservableCollection<Member>();
+            foreach (var member in App.Config.Members)
+                members.Add(Member.Create(member.Name, member.Call, member.EMail, member.EmployeeNo));
+            OnPropertyChanged(nameof(Members));
+        }
+    }
+}