Add project files.

Gready_Poang.DataLayer/DataClasses/LocalDbService.cs

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+using GreadyPoang.EntityLayer;
+using SQLite;
+
+namespace GreadyPoang.DataLayer;
+
+public class LocalDbService
+{
+    private const string DB_NAME = "PoangDB";
+    private readonly SQLiteAsyncConnection _connection;
+
+    public LocalDbService()
+    {
+        //string dbPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), DB_NAME);  
+        string dbPath = Path.Combine(FileSystem.Current.AppDataDirectory, DB_NAME);
+        _connection = new SQLiteAsyncConnection(dbPath);
+        _connection.CreateTableAsync<Participant>().Wait();
+    }
+
+    public async Task<List<Participant>> GetParticipantsAsync()
+    {
+        return await _connection.Table<Participant>().ToListAsync();
+    }
+
+    public async Task<Participant?> GetParticipantAsync(int id)
+    {
+        return await _connection.Table<Participant>().Where(p => p.ParticipantId == id).FirstOrDefaultAsync();
+    }
+
+    public async Task<int> SaveParticipantAsync(Participant participant)
+    {
+        if (participant.ParticipantId != 0)
+        {
+            return await _connection.UpdateAsync(participant);
+        }
+        else
+        {
+            return await _connection.InsertAsync(participant);
+        }
+    }
+
+    public async Task<int> DeleteParticipantAsync(Participant participant)
+    {
+        return await _connection.DeleteAsync(participant);
+    }
+
+}