[ghex] Remove/rework outdated/obsolete documentation

[Logan Rathbone <larathbone src gnome org>]

commit 4e240a46bc68dd077c61499c9a0fc94b02863907
Author: Logan Rathbone <poprocks gmail com>
Date:   Thu Aug 12 17:05:47 2021 -0400

    Remove/rework outdated/obsolete documentation
    
    Delete 20+ year old README and add README.md
    
    Remove obsolete AUTHORS file
    
    The original author of GHex is Jaca Mocnik and has had many contributors
    of code, documentation and translations since then, which is clearly
    documented in the new README.md and in other places.
    
    Other original authors of various components are clearly documented in
    the copyright headers of source files.

 AUTHORS     |  3 ---
 MAINTAINERS |  8 --------
 README      | 60 ------------------------------------------------------------
 README.md   | 31 +++++++++++++++++++++++++++++++
 4 files changed, 31 insertions(+), 71 deletions(-)
---
diff --git a/README.md b/README.md
new file mode 100644
index 00000000..b7628f67
--- /dev/null
+++ b/README.md
@@ -0,0 +1,31 @@
+# GHex
+
+GHex is a hex editor for the GNOME desktop.
+
+GHex can load raw data from binary files and display them for editing in
+a traditional hex editor view. The display is split in two columns, with
+hexadecimal values in one column and the ASCII representation in the
+other. GHex is a useful tool for working with raw data.
+
+## System Requirements
+
+Please see the meson.build file for details.
+
+# Use
+
+Please refer to the help files.
+
+# Authors and Copyright Information
+
+The original author of GHex was Jaka Mocnik, who licensed it under the
+GPLv2+. Please see the COPYING file for a full copy of the licence.
+
+It has been maintained by various other individuals since then. Please see the
+ghex.doap file for current maintainer contact information.
+
+The source files of GHex have had various copyright-holders over the
+years, who have all maintained GHex consistently under the
+above-mentioned licence.
+
+Comments, ideas, bug reports and patches are very welcome. Please
+utilize the GitLab Issues and Merge Request systems.