Update repositories.txt (#4511)

Author: ahmedosama07

repositories.txt

@@ -473,6 +473,7 @@ https://github.com/aharshac/StringSplitter
 https://github.com/ahmedarif193/Hlw8032
 https://github.com/ahmedosama07/LineFollowerPID
 https://github.com/ahmedosama07/mDriverL298n
+https://github.com/ahmedosama07/PID-autotune
 https://github.com/AhmedYousryM/NonBlockingSequence
 https://github.com/ahmsec/fork-webbino-ahmsec
 https://github.com/ai-techsystems/arduino