Initial commit of the ClosedXML library

Establishes the foundational structure, core Excel functionality, and tooling.

- Implements base components for cells, ranges, columns, and rows.
- Integrates a custom calculation engine with a wide range of Excel functions.
- Adds comprehensive support for styling, conditional formatting, data validation, comments, pictures, and charts.
- Configures build setup, project metadata (NuGet), and developer guidelines.
- Includes editor and Git attributes for consistent code style and line endings.

ClosedXML_Examples/Delete/DeleteFewWorksheets.cs

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+using System.IO;
+using ClosedXML.Excel;
+
+namespace ClosedXML_Examples.Delete
+{
+    public class DeleteFewWorksheets:IXLExample
+    {
+        public void Create(string filePath)
+        {
+            string tempFile = ExampleHelper.GetTempFilePath(filePath);
+            try
+            {
+                //Note: Prepare
+                {
+                    var workbook = new XLWorkbook();
+                    workbook.Worksheets.Add("1");
+                    workbook.Worksheets.Add("2");
+                    workbook.Worksheets.Add("3");
+                    workbook.Worksheets.Add("4");
+                    workbook.SaveAs(tempFile);
+                }
+
+                //Note: Delate few worksheet
+                {
+                    var workbook = new XLWorkbook(tempFile);
+                    workbook.Worksheets.Delete("1");
+                    workbook.Worksheets.Delete("2");
+                    workbook.SaveAs(filePath);
+                }
+            }
+            finally
+            {
+                if (File.Exists(tempFile))
+                {
+                    File.Delete(tempFile);
+                }
+            }
+            
+        }
+    }
+}

ClosedXML_Examples/Delete/DeleteRows.cs

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+using System;
+using System.Linq;
+using ClosedXML.Excel;
+
+
+namespace ClosedXML_Examples.Delete
+{
+    public class DeleteRows : IXLExample
+    {
+        #region Variables
+
+        // Public
+
+        // Private
+
+
+        #endregion
+
+        #region Properties
+
+        // Public
+
+        // Private
+
+        // Override
+
+
+        #endregion
+
+        #region Events
+
+        // Public
+
+        // Private
+
+        // Override
+
+
+        #endregion
+
+        #region Methods
+
+        // Public
+        public void Create(String filePath)
+        {
+            #region Create case
+            {
+                var workbook = new XLWorkbook();
+                var ws = workbook.Worksheets.Add("Delete red rows");
+
+                // Put a value in a few cells
+                foreach (var r in Enumerable.Range(1, 5))
+                    foreach (var c in Enumerable.Range(1, 5))
+                        ws.Cell(r, c).Value = string.Format("R{0}C{1}", r, c);
+
+
+                var blueRow = ws.Rows(1, 2);
+                var redRow = ws.Row(5);
+
+                blueRow.Style.Fill.BackgroundColor = XLColor.Blue;
+
+                redRow.Style.Fill.BackgroundColor = XLColor.Red;
+                workbook.SaveAs(filePath);
+            }
+            #endregion
+
+            #region Remove rows
+            {
+                var workbook = new XLWorkbook(filePath);
+                var ws = workbook.Worksheets.Worksheet("Delete red rows");
+
+                ws.Rows(1, 2).Delete();
+                workbook.Save();
+            }
+            #endregion
+
+        }
+
+        // Private
+
+        // Override
+
+
+        #endregion
+    }
+}