update README with a screenshot
update README with a screenshot

Signed-off-by: jonnyhsy <55b60757f7b92541e628e742d025fdc28b1a5442@foxmail.com>

streetrader/streetrader.github.io,sitepoint-editors/fastr,sitepoint-editors/fastr,streetrader/streetrader.github.io,streetrader/streetrader.github.io