Create Notes_Signalling_Unit_log.md
Add markdown to the Notes from the top of the pdf

The first commit of this file had a pretty straight raw paste from the pdftotext output from the Notes for Signalling Unit Log text at the top of the pdf.
This has markdown formatting added in.
Merge pull request #1 from nealmcb/master

Add Notes_Signalling_Unit_log.md file from top of the pdf