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/Rows/RowCollection.cs

@@ -0,0 +1,96 @@
+using System;
+using ClosedXML.Excel;
+
+
+namespace ClosedXML_Examples.Rows
+{
+    public class RowCollection : 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)
+        {
+            var workbook = new XLWorkbook();
+            var ws = workbook.Worksheets.Add("Rows of a Range");
+
+            // All rows in a range
+            ws.Range("A1:B2").Rows().Style.Fill.BackgroundColor = XLColor.DimGray;
+
+            var bigRange = ws.Range("B4:C17");
+
+            // Contiguous rows by number
+            bigRange.Rows(1, 2).Style.Fill.BackgroundColor = XLColor.Red;
+
+            // Contiguous rows by number
+            bigRange.Rows("4:5").Style.Fill.BackgroundColor = XLColor.Blue;
+
+            // Spread rows by number
+            bigRange.Rows("7:8,10:11").Style.Fill.BackgroundColor = XLColor.Orange;
+
+            // Using a single number
+            bigRange.Rows("13").Style.Fill.BackgroundColor = XLColor.Cyan;
+
+            // Adjust the height
+            ws.Rows().Height = 15;
+
+            var ws2 = workbook.Worksheets.Add("Rows of a Worksheet");
+
+            // Contiguous rows by number
+            ws2.Rows(1, 2).Style.Fill.BackgroundColor = XLColor.Red;
+
+            // Contiguous rows by number
+            ws2.Rows("4:5").Style.Fill.BackgroundColor = XLColor.Blue;
+
+            // Spread rows by number
+            ws2.Rows("7:8,10:11").Style.Fill.BackgroundColor = XLColor.Orange;
+
+            // Using a single number
+            ws2.Rows("13").Style.Fill.BackgroundColor = XLColor.Cyan;
+
+            // Adjust the height
+            ws2.Rows("1:13").Height = 15;
+
+            workbook.SaveAs(filePath);
+        }
+
+        // Private
+
+        // Override
+
+
+        #endregion
+    }
+}