Rename top README to README.md, just as done in Tcl. Reformat to md format.

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+# README:  Tk
+
+This is the **Tk 8.5.19** source distribution.
+
+You can get any source release of Tk from [our distribution
+site](https://sourceforge.net/projects/tcl/files/Tcl/).
+
+
+## <a id="intro">1.</a> Introduction
+
+This directory contains the sources and documentation for Tk, a
+cross-platform GUI toolkit implemented with the Tcl scripting language.
+
+For details on features, incompatibilities, and potential problems with
+this release, see [the Tcl/Tk 8.5 Web page](https://www.tcl.tk/software/tcltk/8.5.html)
+or refer to the "changes" file in this directory, which contains a
+historical record of all changes to Tk.
+
+Tk is maintained, enhanced, and distributed freely by the Tcl community.
+Source code development and tracking of bug reports and feature requests
+takes place at [core.tcl-lang.org](https://core.tcl-lang.org/).
+Tcl/Tk release and mailing list services are [hosted by
+SourceForge](https://sourceforge.net/projects/tcl/)
+with the Tcl Developer Xchange hosted at
+[www.tcl-lang.org](https://www.tcl-lang.org).
+
+Tk is a freely available open source package.  You can do virtually
+anything you like with it, such as modifying it, redistributing it,
+and selling it either in whole or in part.  See the file
+`license.terms` for complete information.
+
+## <a id="tcl">2.</a> See Tcl README.md
+
+Please see the README.md file that comes with the associated Tcl release
+for more information.  There are pointers there to extensive
+documentation.  In addition, there are additional README files
+in the subdirectories of this distribution.