Add pagination classes and extensions

src/TemplateFastEndpoints.API/Extensions/PaginationExtensions.cs

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+using TemplateFastEndpoints.API.Utils;
+
+namespace TemplateFastEndpoints.API.Extensions;
+
+public static class PaginationExtensions
+{
+    /// <summary>
+    /// Extension method to paginate a source collection.
+    /// </summary>
+    /// <typeparam name="T">The type of the elements in the source.</typeparam>
+    /// <param name="source">The source collection to paginate. Can be IQueryable or IEnumerable.</param>
+    /// <param name="pageNumber">The page number to retrieve.</param>
+    /// <param name="pageSize">The page size (number of items per page).</param>
+    /// <returns>A paginated response containing the items on the requested page and pagination information.</returns>
+    public static PaginatedResponse<T> ToPaginatedResult<T>(this IEnumerable<T> source, int pageNumber, int pageSize)
+    {
+        var enumerable = source as IQueryable<T> ?? source.AsQueryable();
+        var items = enumerable.Skip((pageNumber - 1) * pageSize).Take(pageSize).ToList();
+
+        var totalRecords = enumerable.Count();
+        var totalPages = (int)Math.Ceiling((double)totalRecords / pageSize);
+        return new PaginatedResponse<T>(items, pageNumber, pageSize, totalPages, totalRecords);
+    }
+}

src/TemplateFastEndpoints.API/Utils/PaginatedRequest.cs

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+namespace TemplateFastEndpoints.API.Utils;
+
+public class PaginatedRequest
+{
+    public int PageNumber { get; set; }
+    public int PageSize { get; set; }
+}

src/TemplateFastEndpoints.API/Utils/PaginatedResponse.cs

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+namespace TemplateFastEndpoints.API.Utils;
+
+public class PaginatedResponse<T>
+{
+    public PaginatedResponse(IEnumerable<T> data, int pageNumber, int pageSize,int totalPages, int totalRecords)
+    {
+        Data = data;
+        PageNumber = pageNumber;
+        PageSize = pageSize;
+        TotalPages = totalPages;
+        TotalRecords = totalRecords;
+    }
+
+    public IEnumerable<T> Data { get; set; }
+    public int PageNumber { get; set; }
+    public int PageSize { get; set; }
+    public int TotalPages { get; set; }
+    public int TotalRecords { get; set; }
+}