Rename CONTRIBUTORS to MAINTAINERS and update list to current state

Author: katiewasnothere

CONTRIBUTORS.txt renamed to MAINTAINERS.txt

@@ -1,23 +1,26 @@
-This file contains a list of contributors who have made meaningful changes to this repository.
-Please add your name and GitHub handle to this file as an optional step in the contribution process for attribution.
-Email is not required.
+This file contains a list of maintainers and past maintainers who have made meaningful changes to this repository.
 
-### Contributors
+### Maintainers
 
 Aditya Ramani (adityaramani)
-Agam Dua (agamdua)
+AJ Emory (ajemory)
 Danny Canter (dcantah)
 Dmitry Kovba (dkovba)
 Eric Ernst (egernst)
-Evan Hazlett (ehazlett)
-Gilbert Song (gilbert88)
-Hugh Bussell (hughbussell)
 John Logan (jglogan)
 Kathryn Baldauf (katiewasnothere)
 Madhu Venugopal (mavenugo)
 Michael Crosby (crosbymichael)
-Nandha Reddy (nandsha)
+Raj Aryan Singh (realrajaryan)
 Sidhartha Mani (wlan0)
+Yibo Zhuang (yibozhuang)
+
+
+### Emeritus maintainers
+
+Agam Dua (agamdua)
+Evan Hazlett (ehazlett)
+Gilbert Song (gilbert88)
+Hugh Bussell (hughbussell)
 Tanweer Noor (tanweernoor)
 Ximena Perez Diaz (ximenanperez)
-Yibo Zhuang (yibozhuang)