Documentation: little update

README.md

@@ -1,7 +1,12 @@
 Documentation: http://qtxlsx.debao.me
 
 QtXlsx is a library that can read and write Excel files. It doesn't require Microsoft Excel and can be used in any platform that Qt5 supported.
+The library can be used to
 
+* Generate a new .xlsx file from scratch
+* Extract data from an existing .xlsx file
+* Edit an existing .xlsx file
+ 
 ## Getting Started
 
 ### Usage(1): Use Xlsx as Qt5's addon module

src/xlsx/doc/src/qtxlsx-index.qdoc

@@ -40,6 +40,14 @@
     The \l{Qt Xlsx C++ Classes}{Qt Xlsx Module} provides a set of classes to read and write Excel files. It doesn't require
     Microsoft Excel and can be used in any platform that Qt5 supported.
 
+    The library can be used to
+
+    \list
+       \li Generate a new .xlsx file from scratch
+       \li Extract data from an existing .xlsx file
+       \li Edit an existing .xlsx file
+    \endlist
+
     \section1 Getting Started
 
     To include the definitions of the module's classes, using the following directive: