Added simple readme

README.md

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+# Telnet Debugger
+
+This is just a little utility to tell you what telnet commands are supported by a telnet client.
+
+It doesn't currently tell you anything about how well those options work. This is not ideal.
+
+
+## Building and running
+
+1. Install a reasonably recent D compiler: https://dlang.org/download.html
+2. Run `dub build`
+3. Run `./telnetdebugger`
+4. Point your telnet client at `localhost:2323`
+