Create README.md

README.md

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+# DatasToExcel
+
+[![Target Framework](https://img.shields.io/badge/%2ENet%20Core-3.0-green.svg)](https://docs.microsoft.com/en-us/dotnet/core/about)
+[![Lincense](https://img.shields.io/badge/Lincense-MIT-orange.svg)](https://github.com/Fei-Sheng-Wu/DatasToExcel/blob/1.0.0/LICENSE.txt)
+
+> A 2D array to Excel file converter, support header first row and fixed headers. It uses .Net Core 3.0 as framework and only depends on the Open Xml SDK.
+
+## Dependencies
+
+**.Net Core** >= 3.0  
+**DocumentFormat.OpenXml** = 2.10.1
+
+## Main Features
+
+- [x] 2D array to Excel
+- [x] Header first row (optional)
+- [x] Fixed first row (optional)
+
+## How to Use
+
+Create a 2D array first.
+
+```c#
+string[,] datas = new string[,]
+{
+    { "Name", "Country", "Age", "Career" },
+    { "Helen", "U.S.", "21", "Police" },
+    { "Jucia", "Canada", "34", "Dancer" },
+    { "Erik", "Canada", "13", "Student" },
+    { "Bob", "British", "26", "Business person" },
+    { "Nancy", "Russia", "64", "Fisherman" },
+};
+```
+
+And convert it to Excel and save to a fixed path.
+
+```c#
+datas.GenerateExcel(filename); //Do not header first row
+datas.GenerateExcel(filename, true); //Header first row
+```
+
+Or save it to a memory stream.
+
+```c#
+//Option 1
+MemoryStream ms = datas.GenerateExcel(); //Do not header first row
+MemoryStream ms = datas.GenerateExcel(true); //Header first row
+
+//Option 2
+using (MemoryStream ms = new MemoryStream())
+{
+    datas.GenerateExcel(ms); //Do not header first row
+    datas.GenerateExcel(ms, true); //Header first row
+}
+```
+
+## License
+
+This project is under the [MIT License](https://github.com/Fei-Sheng-Wu/DatasToExcel/blob/1.0.0/LICENSE.txt).