Add beep-boop-robot challenge

TJCTF 2023/beep-boop-robot/README.md

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+# beep-boop-robot
+> beep boop, it sounds like a robot. sus.....
+
+## About the challenge
+
+We have given about .wav file called `robot.wav`, which is if you play it sounds like morse code. (You can download it [here](file/robot.wav))
+
+## How to Solve
+
+We can use tool on [DataBorder Morse Decoder](https://databorder.com/transfer/morse-sound-receiver/). You just need upload the wav file and press `Play`
+
+![flag](images/flag.jpg)
+
+Since the flag format is lowercase so the flag is
+
+```
+tjctf{thisisallonewordlmao}
+```