Initial LyX support

Setting up LyX.md

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+# Setting up LyX to work with programming.cls
+
+These instructions were written originally for a macOS machine.
+
+On macOS:
+
+    mkdir -p ~/Library/texmf/tex/latex/programming
+    cp programming.cls ~/Library/texmf/tex/latex/programming/.
+
+    mkdir -p ~/Library/Application\ Support/LyX-2.4/layouts
+    cp programming.layout ~/Library/Application\ Support/LyX-2.4/layouts
+
+On Linux (Debian):
+
+    mkdir -p ~/texmf/tex/latex/programming
+    cp programming.cls ~/texmf/tex/latex/programming/.
+
+    mkdir -p ~/.lyx/layouts
+    cp programming.layout ~/.lyx/layouts
+
+Run Tools > Reconfigure from LyX.
+
+Restart LyX.
+
+Now "Programming" should show up in Document Settings > Document Class.
+
+You probably want to choose "Use non-TeX fonts (via XeTeX/LuaTeX)" for each document that uses
+this class, too.
+
+## Use the LuaTeX renderer
+
+You will need to build documents using the LyX "PDF (LuaTeX)" file format. You can either
+select this each time from the menu or change the application-wide default.
+
+To change the default, go to Preferences > File Handling > File Formats. Near the bottom of the
+screen is a panel labelled "Default Output Formats".
+
+By default, "With TeX fonts" is set to "PDF (pdflatex)", and "With non-TeX fonts" is set to
+"PDF (XeTeX)".
+
+It's fine to set both to "PDF (LuaTeX)".
+
+Alternatively, change only the non-TeX one, and on a document-by-document basis, in Document
+Settings > Fonts, choose "Use non-TeX fonts (via XeTeX/LuaTeX)".
+
+## Bibliographies
+
+It's probably best to switch Document Settings > Bibliography > Citation Style > Style format
+to "Biblatex". Delete the text from the "Biblatex citation style" and "Biblatex bibliography
+style" fields.