README.md in sysadmin-0.1.5 vs README.md in sysadmin-0.2.0

@@ -10,9 +10,42 @@
 The collection of libraries for managing the system.
 
 See doc/README(.ja).
 
 
+Purpose
+-------
+
+**Array**
+
+Extension for Array class. Array operation to be used well in the System Management.
+
+
+**Dir**
+
+Method filelist provides an intelligent directory scanning.
+
+
+**Sysadmin::Directory**
+
+Return file list matching regexp.
+
+
+**File**
+
+Providing useful file operations. Method zread is open zip and other type files. *line methods provides append, replace, and remove line of file.
+
+
+**Time**
+
+Providing strict_parse methods. This new method return nil when specified invalid date.
+
+
+**Util**
+
+Other useful methods.
+
+
 Development
 -----------
 
 We need your help.