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/StyleExamples.cs

@@ -0,0 +1,74 @@
+using ClosedXML_Examples.Styles;
+using System.IO;
+
+namespace ClosedXML_Examples
+{
+    public class StyleExamples
+    {
+        #region Variables
+
+        // Public
+
+        // Private
+
+
+        #endregion
+
+        #region Properties
+
+        // Public
+
+        // Private
+
+        // Override
+
+
+        #endregion
+
+        #region Constructors
+
+        // Public
+        public StyleExamples()
+        {
+
+        }
+
+
+        // Private
+
+
+        #endregion
+
+        #region Events
+
+        // Public
+
+        // Private
+
+        // Override
+
+
+        #endregion
+
+        #region Methods
+
+        // Public
+        public void Create()
+        {
+            var path = Program.BaseCreatedDirectory;
+            new StyleFont().Create(Path.Combine(path, "styleFont.xlsx"));
+            new StyleFill().Create(Path.Combine(path, "styleFill.xlsx"));
+            new StyleBorder().Create(Path.Combine(path, "styleBorder.xlsx"));
+            new StyleAlignment().Create(Path.Combine(path, "styleAlignment.xlsx"));
+            new StyleNumberFormat().Create(Path.Combine(path, "styleNumberFormat.xlsx"));
+            new StyleIncludeQuotePrefix().Create(Path.Combine(path, "styleIncludeQuotePrefix.xlsx"));
+        }
+
+        // Private
+
+        // Override
+
+
+        #endregion
+    }
+}