Added `syntax_highlighting/` folder and instructions for vim and neatvi.

diff --git a/syntax_highlighting/README.md b/syntax_highlighting/README.md
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+VVhitespace Syntax Highlighting
+===============================
+
+![VVS Syntax Highlighting Example](vvs_syntax_highlighting.gif)
+
+I find it useful to highlight each IMP a different color as well as highlight
+code comments and label definitions. The above image is typical of my
+VVhitespace editing environment.
+
+If you would like something similar, the configuration examples below can be
+used with `vim` or `neatvi`. Other editors that use regex matching can reuse
+the regular expressions from these examples to achieve similar results.
+
+This syntax highlighting definition works only with the way I write VVhitespace
+code in this repository. Comments in particular can take many forms other
+than specified here.
+
+If you take the time to put together a configuration for other editors, or
+improve the regex definitions, let me know.
+
+
+VIM Highlighting
+----------------
+
+If they don't already exist, create the folders `~/.vim/syntax` and
+`~/.vim/ftdetect`.
+
+    % mkdir -p ~/.vim/syntax
+    % mkdir -p ~/.vim/ftdetect
+
+Create a file named `~/.vim/ftdetect/vvhitespace.vim` to detect the filetype
+based on the file extension. It should contain a single line:
+
+    au BufRead,BufNewFile *.pvvs set filetype=vvhitespace
+
+Create a file named `~/.vim/syntax/vvhitespace.vim` containing the following:
+
+    if exists("b:current_syntax")
+      finish
+    endif
+    
+    let b:current_synax = "vvhitespace"
+    
+    " Stack IMP
+    syn match stackIMP '^[sS][sS]'
+    syn match stackIMP '^[sS][nN][sStTnN]'
+    
+    " Arithmetic IMP
+    syn match arithIMP '^[tT][sS][sStT][sStTnN]'
+    
+    " Heap IMP
+    syn match heapIMP '^[tT][tT][sStT]'
+    
+    " Control Flow IMP
+    syn match controlIMP '^[nN][nNsStT][nNsStT]'
+    
+    " IO IMP
+    syn match ioIMP '^[tT][nN][sStT][sStT]'
+    
+    " Label Definition
+    syn match labelDef 'V[sStT]\+N'
+    
+    " Comments
+    syn match commentBlock '|.*$'
+    syn match commentBlock '@.*$'
+    
+    " Define colors using existing Highlight Groups.
+    " To see a list of other Highlight Groups, type `:highlight` in vim.
+    hi def link stackIMP     Type
+    hi def link arithIMP     ModeMsg
+    hi def link heapIMP      Special
+    hi def link controlIMP   Constant
+    hi def link ioIMP        Keyword
+    hi def link labelDef     Function
+    hi def link commentBlock NonText
+
+That's it! You should now see syntax highlighting when opening files with names
+ending in `*.pvvs`.
+
+If you don't any see syntax highlighting, check your `.vimrc` and other config
+locations for conflicting options. Try manually enabling syntax highlighting
+with the `syntax on` configuration directive.
+
+
+NeatVI Highlighting
+-------------------
+
+Open the file `conf.h` for editing.
+
+Add the following line to the `filetypes` array, matching all `*.pvvs` files.
+
+    {"pvvs", "\\.pvvs$"},    /* VVhitespace */
+
+Add the following block to the `highlights` array.
+
+    {"pvvs", {2}, "^[sS][sS]"},                  /* IMP: Stack Manipulation */
+    {"pvvs", {2}, "^[sS][nN][sStTnN]"},          /* IMP: Stack Manipulation */
+    {"pvvs", {8}, "^[tT][sS][sStT][sStTnN]"},    /* IMP: Arithmetic */
+    {"pvvs", {5}, "^[tT][tT][sStT]"},            /* IMP: Heap Access */
+    {"pvvs", {1}, "^[nN][nNsStT][nNsStT]"},      /* IMP: Control Flow */
+    {"pvvs", {4}, "^[tT][nN][sStT][sStT]"},      /* IMP: Input/Output */
+    {"pvvs", {6 | SYN_BD}, "V[sStT]+N "},        /* Label Definitions */
+    {"pvvs", {3 | SYN_IT}, "\\|.*$"},            /* Comments */
+    {"pvvs", {3 | SYN_IT}, "\\@.*$"},            /* Comments */
+
+Recompile NeatVI and syntax highlighting should work on all files with names
+ending in `*.pvvs`.

diff --git a/syntax_highlighting/vvhitespace.vim b/syntax_highlighting/vvhitespace.vim
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+" Vim syntax file
+" Language: VVhitespace
+" Based on: https://vim.fandom.com/wiki/Creating_your_own_syntax_files
+
+if exists("b:current_syntax")
+  finish
+endif
+
+let b:current_synax = "vvhitespace"
+
+" Stack IMP
+syn match stackIMP '^[sS][sS]'
+syn match stackIMP '^[sS][nN][sStTnN]'
+
+" Arithmetic IMP
+syn match arithIMP '^[tT][sS][sStT][sStTnN]'
+
+" Heap IMP
+syn match heapIMP '^[tT][tT][sStT]'
+
+" Control Flow IMP
+syn match controlIMP '^[nN][nNsStT][nNsStT]'
+
+" IO IMP
+syn match ioIMP '^[tT][nN][sStT][sStT]'
+
+" Label Definition
+syn match labelDef 'V[sStT]\+N'
+
+" Comments
+syn match commentBlock '|.*$'
+syn match commentBlock '@.*$'
+
+" Define colors using existing Highlight Groups.
+" To see a list of other Highlight Groups, type `:highlight` in vim.
+hi def link stackIMP     Type
+hi def link arithIMP     ModeMsg
+hi def link heapIMP      Special
+hi def link controlIMP   Constant
+hi def link ioIMP        Keyword
+hi def link labelDef     Function
+hi def link commentBlock NonText

diff --git a/syntax_highlighting/vvs_syntax_highlighting.gif b/syntax_highlighting/vvs_syntax_highlighting.gif
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