删除一个多余的readme.txt for ftk

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1127 bbd45198-f89e-11dd-88c7-29a3b14d5316

components/external/readme.txt

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-1). remove hidden directory "./ftk/.svn"
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-2). svn checkout http://ftk.googlecode.com/svn/trunk/ ftk
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-3). create a directory name "ftk" in your sd card
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-4). copy directory "./ftk/data", "./ftk/theme", "./ftk/testdata" to directory "ftk" which in your sd card
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-5). make sure RT_USING_FTK is defined and RT_USING_RTGUI is undefined
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-6). compile it
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-                                                   Jiao JinXing <jiaojinxing1987@gmail.com>