add: Listagem de clientes

Data/SqliteClientRepository.cs

@@ -20,8 +20,32 @@ namespace Workshop8.Data
 
         public async Task<IEnumerable<Cliente>> GetAllClientsAsync()
         {
-            // TODO: implementar SELECT
-            return new List<Cliente>();
+            var clientes = new List<Cliente>();
+
+            await using (var connection = new SqliteConnection(_connectionString))
+            {
+                await connection.OpenAsync();
+                await using (var cmd = connection.CreateCommand())
+                {
+                    cmd.CommandText = @"SELECT Id, Nome, Email, CriadoEm
+                                        FROM Clientes
+                                        ORDER BY Id;";
+                    await using (var reader = await cmd.ExecuteReaderAsync())
+                    {
+                        while (await reader.ReadAsync())
+                        {
+                            clientes.Add(new Cliente
+                            {
+                                Id       = reader.GetInt32(0),
+                                Nome     = reader.GetString(1),
+                                Email    = reader.GetString(2),
+                                CriadoEm = reader.GetDateTime(3)
+                            });
+                        }
+                    }
+                }
+            }
+            return clientes;
         }
 
         public async Task AddClientAsync(Cliente c)