Add AssocTree repository link

Author: tanakamasayuki

repositories.txt

@@ -7045,6 +7045,7 @@ https://github.com/tanakamasayuki/ESP32CertBundle
 https://github.com/tanakamasayuki/ESP32SerialCtl
 https://github.com/tanakamasayuki/EmbedFS
 https://github.com/tanakamasayuki/EspHelper
+https://github.com/tanakamasayuki/AssocTree
 https://github.com/TanPitch/ButtonKing
 https://github.com/TaraHoleInIt/Subpixie
 https://github.com/tasos12/ev3-arduino