Add README.md files.

README.md

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+# QED Archive
+
+## Introduction
+
+This is an archive of the source code for various versions of
+the QED editor.  It is the result of some discussions on the
+mailing list of [The Unix Historical Society](http://www.tuhs.org)
+in October of 2018.
+
+It started based on the fact that I have a tarball from 1987 of
+QED source code which was lacking some documentation. I asked about
+it on the mailing list.
+
+Members of the list helped out, and also contributed other versions,
+which I have included here. I thank everyone who contributed to the
+discussion and who sent me source code tarballs and/or zip files.
+
+## Contents
+
+The directories are listed here in approximate chronological order
+of the QED version for which they apply. Each directory has its
+own `README.md` file.
+
+* `sds-940`: QED for the XXX 930 and 940 systems in the late 1960s.
+
+* `multics`: What seems to be the last version of QED for MULTICS, 19xx.
+
+* `usenix-80-caltech`: QED scripts from a 1980 USENIX software
+distribution tape.
+P
+* `unix-1985`: My tarball from 1987. The files therein have dates
+in XXXX 1985.
+
+* `unix-1992`: A tarball supplied to me by Rob Pike, one of the original
+authors of QED for Unix when at the University of Toronto. The files
+have dates in 1992.
+
+* `visual-studio-1994`: A version of Unix QED ported to Visual Studio, circa
+1994, supplied by Don Mitchell.
+
+## Other Archives
+
+There are other relevant GitHub archives of QED. Since they're already
+on GitHub, I saw no reason to replicate them here.
+
+* The code for [CTSS QED](https://github.com/rcornwell/ctss/tree/master/src/edit). 
+Pointer provided by XXXX.
+
+* Leah Neukirchen's
+[up-to-date port of QED](https://github.com/chneukirchen/qed-caltech).
+
+## Other Notes
+
+I have attempted to use various Git incantations to make the files
+appear to have the commit dates as recorded in the tarballs and zip
+files I received, even though they actually predate Git's invention.
+
+#### Last Updated
+
+Wed Dec 26 18:31:47 IST 2018

multics/README.md

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+# Multics 12.5 QED
+
+## Introduction
+
+These files were supplied to me by Charles Anthony
+(charles.unix.pro AT gmail.com).  I have no idea where he got them.
+
+## Contents
+
+There are source files and documentation files. I have no idea
+how to build or use them.  Enjoy.
+
+#### Last Updated
+
+Mon Dec 24 18:15:00 IST 2018

sds-940/README.md

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+# QED For The SDS 940
+
+## Introduction
+
+These files were supplied to me by Lars Brinkhoff (lars AT nocrew.org).
+I have no idea where he got them.
+
+## Contents
+
+The two `.txt` files are the source for the editor itself, in
+assembly language.
+
+There are two different reference manuals, one fron 1968, and one
+from 1969, describing QED.
+
+#### Last Updated
+
+Sun Dec 23 19:03:51 IST 2018

unix-1985/README.md

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+# QED For Unix - 1985
+
+# Introduction
+
+The files in this directory are from a tarball
+I received in 1987.  The file is dated October 30, 1987 in my filesystem,
+but the files themselves date from 1985.
+
+I no longer remember who gave it to me.  I also have to admit
+that I never actually used QED; I think I read the manual page and
+decided that it was too complicated for me. :-)
+
+Having skimmed the code, it would take work to bring it up to date
+for modern systems. I think that
+[Leah Neukirchen's version](https://github.com/chneukirchen/qed-caltech)
+would be better than trying to use this old code.
+I am providing it mainly out of historical interest.
+
+#### Last Updated
+
+Tue Dec 25 18:23:08 IST 2018

unix-1992/README.md

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+# QED For Unix - 1992
+
+# Introduction
+
+The files in this directory are from a tarball sent to me by Rob Pike
+(r AT golang.org),
+one of the original developers of QED at the University of Toronto.
+The files are dated September 7, 1992.  I chose not to try to layer
+them on top of the files I have from 1985, but simply to present
+them as I received them.
+
+Of note is that there is more documentation here than in my tarball.
+
+#### Last Updated
+
+Mon Dec 31 18:13:51 IST 2018

usenix-80-caltech/README.md

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+# QED Files From The 1980 USENIX Tape
+
+## Introduction
+
+These files are from the `boulder/caltech/q` directory in the
+Usenix 1980 Delaware tape.  Warren Toomey pointed me to them.
+The tape itself is available from the 
+[TUHS archives](https://www.tuhs.org//Archive/Applications/Shoppa_Tapes/usenix_80_delaware.tar.gz).
+
+#### Last Updated
+
+Mon Dec 24 18:21:21 IST 2018

visual-studio-1994/README.md

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+# QED - Visual Studio
+
+## Introduction
+
+I got these files from Don Mitchell.
+They are a port of Rob Pike's QED to compile on Windows with
+Visual Studio.
+Don writes:
+
+	Rob's tar file is probably what you want.   Here's the windows
+	version, which is some version of QED with an extra file that
+	crudely simulates the UNIX sbrk call.
+
+The original zip file has various object files and files that Visual Studio
+creates which I have removed from the directory. I am including the
+zip file in case they may be of interest.
+
+#### Last Updated
+
+Wed Dec 26 18:04:45 IST 2018