Add Gt841/plugin-pptgo (#2422)

Co-authored-by: guantao <gt841@users.noreply.github.com>
Co-authored-by: Jeffrey Chen <78434827+TCOTC@users.noreply.github.com>

Author: Gt841

plugins.txt

@@ -602,4 +602,5 @@ FlowMorph/siyuan-comments
 lfl-karl-el/buleks-todo
 cyIyd/simofat
 MultiHugo/siyuan-plugin-extended-comments
+Gt841/plugin-pptgo
 Gt841/plugin-boardmix-maintained