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/InsertRows.cs

@@ -0,0 +1,83 @@
+using System;
+using System.Linq;
+using ClosedXML.Excel;
+
+
+namespace ClosedXML_Examples.Rows
+{
+    public class InsertRows : 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("Inserting Rows");
+
+            // Color the entire spreadsheet using rows
+            ws.Rows().Style.Fill.BackgroundColor = XLColor.LightCyan;
+
+            // 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 = "X";
+
+            var blueRow = ws.Row(2);
+            var redRow = ws.Row(5);
+
+            blueRow.Style.Fill.BackgroundColor = XLColor.Blue;
+            blueRow.InsertRowsBelow(2);
+
+
+            redRow.Style.Fill.BackgroundColor = XLColor.Red;
+            redRow.InsertRowsAbove(2);
+
+            ws.Columns(3, 4).Style.Fill.BackgroundColor = XLColor.Orange;
+            ws.Range("A2:A4").InsertRowsBelow(2);
+            ws.Range("B2:B4").InsertRowsAbove(2);
+            ws.Range("C2:C4").InsertRowsBelow(2);
+            ws.Range("D2:D4").InsertRowsAbove(2);
+
+            workbook.SaveAs(filePath);
+        }
+
+        // Private
+
+        // Override
+
+
+        #endregion
+    }
+}