Update README.md with screenshots and blackbox testing info

README.md

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 # Longhorn-TN3270
 Generates keys for an aptly named 3270 terminal emulator
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+<img src="https://neo-desktop.github.io/Longhorn-TN3270/images/logo.png" height=100 />
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+###Simply run and Longhorn!
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+![Main screen screenshot](https://neo-desktop.github.io/Longhorn-TN3270/images/mainscreen.png)
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+### Note
+This is mostly for educational purposes only
+Documentation is non-existent
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+If you're interested in how I black-box tested the original samples, checkout [tree/blackbox](/tree/blackbox "the blackbox branch")
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+I just /really/ enjoy taking things apart and trying to put them back together
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+If this helps someone, sweet!
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+Keep on hacking