Update README.md with more specific information

README.md

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-# Longhorn-TN3270
+# Longhorn-TN3270 Blackbox Reverse Engineering
-Generates keys for an aptly named 3270 terminal emulator
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+The code that lives here uses [Frida.re](https://frida.re/ "Frida A world-class dynamic instrumentation framework | Inject JavaScript to explore native apps on Windows, macOS, GNU/Linux, iOS, Android, and QNX") with Python to blackbox test source binaries.
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+Proof of concepts from reverse engineered samples were created in C then ported to C#