anyone make a script for local chat announcing?

looking for a script/ object that will let me have a text I save repeated automatically every few minutes on local chat

You should post script questions in the script forum. But, the most basic method:

string msg = "Your message here.";

default {
     state_entry() {
          llSetTimerEvent(120.0);   // number of seconds between chats
     }
     timer() {
          llWhisper(0, msg);
     }
}

That will whisper, "Your message here." every 2 minutes.

thanks for this

I will note that spamming chat with the same message will make you wildly popular at parties and if your message is advertising goods or services this may be viewed as a violation of the Community Standards which could result in disciplinary action.

I strongly recommend you ask yourself why you would like to do this. You may also wish to look at gestures which allow you to assign trigger a chat message to a single key-stroke, which, unlike the script will come from you instead of your attachment.