Added simplified Chinese readme file.

README.md

@@ -1,4 +1,9 @@
-# NPOI
+<p align="center">
+    <span>English</span> |  
+    <a href="README.zh-CN.md">中文</a>
+</p>
+
+# NPOI
 
 [![NuGet](https://img.shields.io/nuget/v/DotNetCore.NPOI.svg)](https://www.nuget.org/packages/DotNetCore.NPOI)
 [![Build status](https://ci.appveyor.com/api/projects/status/k774la3yfxf0yfv8?svg=true)](https://ci.appveyor.com/project/yuleyule66/npoi)

README.zh_cn.md

@@ -0,0 +1,129 @@
+<p align="center">
+    <a href="README.md">English</a> |   
+    <span>中文</span>
+</p>
+
+# NPOI
+
+[![NuGet](https://img.shields.io/nuget/v/DotNetCore.NPOI.svg)](https://www.nuget.org/packages/DotNetCore.NPOI)
+[![Build status](https://ci.appveyor.com/api/projects/status/k774la3yfxf0yfv8?svg=true)](https://ci.appveyor.com/project/yuleyule66/npoi)
+
+本项目由 .NET Core Community 迁移自上游项目 Tony Qu 的 [NPOI](https://github.com/tonyqus/npoi) 。
+
+## 安装 NuGet 包
+
+```powershell
+Install-Package DotNetCore.NPOI
+```
+
+## 如何在 Linux 上使用？
+
+在 Linux 上，你需要安装 `libgdiplus`。从 1.2.0 开始，还需要 libdl。
+
+- Ubuntu 16.04 及以上：
+  - apt-get install libgdiplus libc6-dev
+  - cd /usr/lib
+  - ln -s libgdiplus.so gdiplus.dll
+- Fedora 23 及以上：
+  - dnf install libgdiplus
+  - cd /usr/lib64/
+  - ln -s libgdiplus.so.0 gdiplus.dll
+- CentOS 7 及以上：
+  - yum install autoconf automake libtool
+  - yum install freetype-devel fontconfig libXft-devel
+  - yum install libjpeg-turbo-devel libpng-devel giflib-devel libtiff-devel libexif-devel
+  - yum install glib2-devel cairo-devel
+  - git clone <https://github.com/mono/libgdiplus>
+  - cd libgdiplus
+  - ./autogen.sh
+  - make
+  - make install
+  - cd /usr/lib64/
+  - ln -s /usr/local/lib/libgdiplus.so gdiplus.dll
+
+- Docker
+  - Alpine
+
+    ```
+    # base sdk-alpine/aspnetcore-runtime-alpine images
+
+    RUN echo "http://dl-cdn.alpinelinux.org/alpine/edge/testing" >> /etc/apk/repositories
+    RUN apk --update add libgdiplus
+    ```
+
+  - Debian
+
+    ```
+    FROM microsoft/dotnet:2.1-aspnetcore-runtime
+    RUN apt-get update && apt-get install -y libgdiplus libc6-dev && ln -s /usr/lib/libgdiplus.so /usr/lib/gdiplus.dll
+    ...
+    ```
+
+## 开始
+
+### 导出 Excel
+
+```csharp
+var newFile = @"newbook.core.xlsx";
+
+using (var fs = new FileStream(newFile, FileMode.Create, FileAccess.Write)) {
+
+    IWorkbook workbook = new XSSFWorkbook();
+
+    ISheet sheet1 = workbook.CreateSheet("Sheet1");
+
+    sheet1.AddMergedRegion(new CellRangeAddress(0, 0, 0, 10));
+    var rowIndex = 0;
+    IRow row = sheet1.CreateRow(rowIndex);
+    row.Height = 30 * 80;
+    row.CreateCell(0).SetCellValue("this is content");
+    sheet1.AutoSizeColumn(0);
+    rowIndex++;
+
+    var sheet2 = workbook.CreateSheet("Sheet2");
+    var style1 = workbook.CreateCellStyle();
+    style1.FillForegroundColor = HSSFColor.Blue.Index2;
+    style1.FillPattern = FillPattern.SolidForeground;
+
+    var style2 = workbook.CreateCellStyle();
+    style2.FillForegroundColor = HSSFColor.Yellow.Index2;
+    style2.FillPattern = FillPattern.SolidForeground;
+
+    var cell2 = sheet2.CreateRow(0).CreateCell(0);
+    cell2.CellStyle = style1;
+    cell2.SetCellValue(0);
+
+    cell2 = sheet2.CreateRow(1).CreateCell(0);
+    cell2.CellStyle = style2;
+    cell2.SetCellValue(1);
+
+    workbook.Write(fs);
+}
+```
+
+### 导出 Word
+
+```csharp
+var newFile2 = @"newbook.core.docx";
+using (var fs = new FileStream(newFile2, FileMode.Create, FileAccess.Write)) {
+    XWPFDocument doc = new XWPFDocument();
+    var p0 = doc.CreateParagraph();
+    p0.Alignment = ParagraphAlignment.CENTER;
+    XWPFRun r0 = p0.CreateRun();
+    r0.FontFamily = "microsoft yahei";
+    r0.FontSize = 18;
+    r0.IsBold = true;
+    r0.SetText("This is title");
+
+    var p1 = doc.CreateParagraph();
+    p1.Alignment = ParagraphAlignment.LEFT;
+    p1.IndentationFirstLine = 500;
+    XWPFRun r1 = p1.CreateRun();
+    r1.FontFamily = "·ÂËÎ";
+    r1.FontSize = 12;
+    r1.IsBold = true;
+    r1.SetText("This is content, content content content content content content content content content");
+
+    doc.Write(fs);
+}
+```