how to include a simple jquery file into a wordpress plugin

Your jQuery is wrong. what you want is jQuery(docu.... not $jQuery(docu....

You should try to make sure the components work individually before you put them together (within reason of course), it will make troubleshooting MUCH easier for you.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)