Added Description

A brief manualpage.
包装成类

一个接口：Searcher.getname(keyword)
优化的接口

返回字典列表：
            result is a list of dictionaries:
                result[i]['Name']: app name
                result[i]['Comment']: app brief introduction
                result[i]['Exec']: app launch method
Debug

修正了一个Bug，该Bug曾导致当.desktop文件中有多个描述时，只保留最后一个。现只取[Desktop Entry]中的项。
Rename main.py to origin.py
Merge branch 'yzf_optimization' into GUI

Conflicts:
	functions.py
fix bugs
merged with yzf
fix bugs