Update readme file

README.md

@@ -1,4 +1,73 @@
+QtXlsx is a library that can write Excel files. It doesn't require Microsoft Excel and can be used in any platform that Qt5 supported.
 
+## Getting Started
+
+### Usage(1): Use source code directly
+
+The package contains a **qtxlsx.pri** file that allows you to integrate the component into applications that use qmake for the build step.
+
+* Download the source code.
+
+* Put the source code in any directory you like. For example, 3rdparty:
+
+```
+    |-- project.pro
+    |-- ....
+    |-- 3rdparty\
+    |     |-- qtxlsx\
+    |     |
+```
+
+* Add following line to your qmake project file:
+
+```
+    include(3rdparty/qtxlsx/src/xlsx/qtxlsx.pri)
+```
+
+* Then, using Qt Xlsx in your code
+
+```cpp
+    #include "xlsxworkbook.h"
+    #include "xlsxworksheet.h"
+    int main()
+    {
+        QXlsx::Workbook workbook;
+        QXlsx::Worksheet *sheet = workbook.addWorksheet();
+        sheet->write("A1", "Hello Qt!");
+        workbook.save("Test.xlsx");
+        return 0;
+    }
+```
+
+**Note**: If you like, you can copy all files from *src/xlsx* to your application's source path. Then add following line to your project file:
+
+```
+    include(qtxlsx.pri)
+```
+
+### Usage(2): Use Xlsx as Qt5's addon module
+
+**Note**: Perl is needed.
+
+* Download the source code.
+
+* Put the source code in any directory you like. At the toplevel directory run
+
+```
+    qmake
+    make
+    make install
+```
+
+The library, the header files, and the feature file will be installed to your system.
+
+* Add following line to your qmake's project file:
+
+```
+    QT += xlsx
+```
+
+* Then, using Qt Xlsx in your code
 
 ## References