fix 1992/westley/README.md, warn about TAB intending in markdown.md

One must **NOT** use ASCII TAB characters to intent text.  Down the TAB-ed
road is nothing but trouble!  There are _quasi-solutions_, however those
have side effects that lead to a different set of problems.

The `markdown.md` was updated to ask that text not be intended with ASCII tabs.

See [Please do NOT use ASCII tabs to indent
text](https://ioccc-src.github.io/temp-test-ioccc/markdown.html#markdown.html#please-do-not-specify-a-language-for-a-code-block).

We discovered this awhile ago and fixed it in markdown files.  Sorry
(tm Canada 🇨🇦), we forgot to mention this this in `markdown.md`.

BTW: It took some **deep magic** to be able to show an HTML comment
after a starting fenced markdown code block!  See the **NO_COMMENT=**
line in `bin/md2html.cfg`.  :-)

TODO: Stamp out indenting TABs in markdown files, especially in code blocks.

TODO: Consider a rule to detect problematic ASCII TAB intendation
      within makrkdown files.

markdown.md

@@ -124,7 +124,7 @@ This code block is NOT indented                   		<=== no thank you
 ````
 
 
-We request that you indent the code block by 4 spaces:
+We request that you indent the code block by 4 ASCII spaces
 
 ````
 ```
@@ -151,6 +151,54 @@ For example, `next/guidelines.md` uses this markdown code block:
 ````
 
 
+## Please do NOT use ASCII tabs to indent text
+
+When indenting a code block in markdown, indent 4 ASCII spaces per level.
+If you need to indent 2 or more levels, use multiples of 4 ASCII spaces.
+Please do **NOT** intend with ASCII tabs!
+
+For example:
+
+````
+```
+	Please do **NOT** indent with ASCII tabs.		<=== no thank you
+
+    The top level starts with a 4 ASCII space indent.
+
+    Only indend with multiples of 4 ASCII spaces.
+        2nd level indent needs 8 ASCII spaces (no tabs).
+            3rd level indent needs 12 ASCII spaces (no tabs).
+                etc.
+```
+````
+
+
+## Please do NOT specify a language for a code block
+
+We request that (fenced) markdown code blocks **NOT** specify a language.
+
+For example:
+
+````
+```c								<=== no thank you
+    int main(void) {return 0;}
+```
+````
+
+Instead, put the language inside an HTML comment, separated from the
+markdown code block starting fence by a space:
+
+````
+``` <%%NO_COMMENT%%!---c-->
+    int main(void) {return 0;}
+```
+````
+
+**IMPORTANT**: The **initial** &nbsp; **\` \` \`** &nbsp; must be followed by an **`ASCII space`**,
+then by an **opening** **`<!---`**, then by the **language**, then by a **closing** **`-->`**.
+
+
+
 ## Please do NOT add trailing slash to HTML elements
 
 Please do **NOT** use a trailing slash on [void HTML