Update readme.txt

Signed-off-by: Joe Devlin <[email protected]>

readme.txt

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+This is a fork of QuickJS to accomplish a few platform ports.   QuickJS is an amazing and tiny implementation of EcmaScript 2020 by Fabrice Bellard and Charlie Gordon under an MIT license.
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+This fork supports porting to ZOS and Windows.  The windows port does not use Cygwin or MinGW, because Windows has come closer in recent years to supporting most Posix API's.   
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 The main documentation is in doc/quickjs.pdf or doc/quickjs.html.
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+More good reading at:  https://bellard.org/quickjs/