CMU-313 / nodebb-spring-26-tigers / 22513148021

push

github

style: added user guide

Context
This PR adds a user guide for the new features (anonymous toggle, answered label, topics search bar for each category)

Description/Changes
User guide for the new features with descriptions of each feature, how to install/use them, and how to test them

Testing
None required (just adding a .md file that is not referenced or run in the actual functionality of NodeBB

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