Kills the Android Debug Bridge.
In some cases the adb.exe process might prevent Unity from closing and/or exiting playmode.
This simple script kills the adb.exe process automatically and silently, eliminating the need to kill the process manually.
The process is killed when you exit playmode, so you can still use adb.exe if you need it.
You will only have use for this if you have one of the above mentioned problems.