Add support to both EPPlus and ClosedXML libraries

.github/copilot-instructions.md

@@ -0,0 +1,10 @@
+
+# Project structure
+This project allows to generat Excel reports using multiple Excel writter libraries (EPPlus and ClosedXML)
+Kevull.MultiHeader.Core contains the interfaces and code agnostic to the excel writter library.
+There is a parallel structure under tests folder for unit tests.
+
+# Additional instructions
+- when moving files use git mv <source> <destination> to trakc changes in git history
+- in public and protected methods and properties, use the <inheritdoc /> tag if the class is inheriteing from a parent; otherwise write the xml documenation
+- write code and aswer in English, even if the question is in another language

.github/workflows/build.yml

@@ -12,14 +12,14 @@ on:
 
 env:
   NUGET_FOLDER: ${{ github.workspace}}/nuget
-  DOTNET_VERSION: 8.0.X
+  DOTNET_VERSION: 10.0.X
   CONFIGURATION: Release
 
 jobs:
   build:
     runs-on: ubuntu-latest
     env:
-      SOLUTION_ROOT: src/Kevull.EPPLus.MultiHeader.sln
+      SOLUTION_ROOT: Kevull.MultiHeader.slnx
 
     steps:
     - uses: actions/checkout@v3

Kevull.MultiHeader.slnx

@@ -0,0 +1,11 @@
+<Solution>
+  <Folder Name="/Tests/">
+    <Project Path="tests/Kevull.MultiHeader.ClosedXml.Tests/Kevull.MultiHeader.ClosedXml.Tests.csproj" />
+    <Project Path="tests/Kevull.MultiHeader.Core.Tests/Kevull.MultiHeader.Core.Tests.csproj" />
+    <Project Path="tests/Kevull.MultiHeader.EPPLus.Tests/Kevull.MultiHeader.EPPLus.Tests.csproj" />
+    <Project Path="tests/Kevull.MultiHeader.TestCommon/Kevull.MultiHeader.TestCommon.csproj" />
+  </Folder>
+  <Project Path="src/Kevull.MultiHeader.ClosedXml/Kevull.MultiHeader.ClosedXml.csproj" />
+  <Project Path="src/Kevull.MultiHeader.Core/Kevull.MultiHeader.Core.csproj" />
+  <Project Path="src/Kevull.MultiHeader.EPPLus/Kevull.MultiHeader.EPPLus.csproj" />
+</Solution>

README.md

@@ -1,7 +1,9 @@
 [![build library](https://github.com/mnieto/Kevull.EPPLus.MultiHeader/actions/workflows/build.yml/badge.svg)](https://github.com/mnieto/Kevull.EPPLus.MultiHeader/actions/workflows/build.yml)
 
 # Kevull.EPPLus.MultiHeader
-Extension for the [EPPlus](https://github.com/EPPlusSoftware/EPPlus) library to create reports from complex objects
+Extension to create Excel reports from complex objects with two implementation flavours:
+- [EPPlus](https://github.com/EPPlusSoftware/EPPlus)
+- [ClosedXML](https://github.com/ClosedXML/ClosedXML)
 
 Given a list like this:
 ```csharp
@@ -35,14 +37,22 @@ Given a list like this:
             };
 ```
 
-this code:
+With EPPlus:
 ```csharp
             using var xls = new ExcelPackage();
             var report = new MultiHeaderReport<RootLevel>(xls, "Object");
             report.GenerateReport(complexObject);
             xls.SaveAs("Report.xlsx");
 ```
 
+Equivalent code with ClosedXML:
+```csharp
+            using var xls = new XLWorkbook();
+            var report = new MultiHeaderReport<RootLevel>(xls, "Object");
+            report.GenerateReport(complexObject);
+            report.Save("Report.xlsx");
+```
+
 will render like this:
 
 ![image](.github/example.png)
@@ -184,4 +194,5 @@ Default top-left cell is A1. With `SetStartingAddress` you can specify any other
 - Append rows to an existing report ✓
 - Posibility to change the top-left starting point ✓
 - Target netstandard 2.0 in nuget package ✓
-- Frozen rows and columns ✓
+- Dual implementation with EPPlus and ClosedXML ✓
+- Frozen rows and columns ✓