monaco preview specification (#10136)

* Create preview-monaco.md

* Update preview-monaco.md

* Update preview-monaco.md

* Update preview-monaco.md

* Update expect.txt

* Update preview-monaco.md

* Update preview-monaco.md

added a bit more information up front. Added in new requirement at the bottom that i think we should discuss.

* Update preview-monaco.md

Co-authored-by: Clint Rutkas <clint@rutkas.com>

.github/actions/spell-check/expect.txt

@@ -1586,6 +1586,8 @@ pguid
 phbm
 phbmp
 Phishing
+php
+phptest
 phwnd
 pici
 pid
@@ -1701,6 +1703,7 @@ pwcs
 PWSTR
 pwtd
 px
+py
 Qand
 QI
 qianlifeng
@@ -1826,6 +1829,7 @@ runsettings
 runtimeclass
 runtimeconfig
 runtimes
+rutkas
 rv
 rvalue
 rvm