Add temporary TODO file

Author: erikhatcher

docs/99_TODO.md

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+* Remove "corp" from all Playground links
+* Fire up ProcessCene and generate some analysis images, etc
+* Polish headers/footers
+* Fix publishing to GH Pages
+* rename .md's to .mdx's
+* rename Playground section to something else - it's the workshop practicals
+* should completed/solved playgrounds be saved and linked in here as well?
+
+Cool Tricks
+Which clause matches?
+https://search-playground.corp.mongodb.com/tools/code-playground/snapshots/669e82e12ce7658e786edc03
+Which embedded document matched?
+https://search-playground.corp.mongodb.com/tools/code-playground/snapshots/669e850dd49ef6fad98118d6
+Using scoreDetails to glimpse analysis in action: