I'd like to put a Share on Slack button on my website.   It would be similar to the buttons we have for Share on Facebook and Share on Twitter.  A user would click on it and be able to post some text and a link that we suggest on Slack.I've been able to find URLs that I can use on Facebook and Twitter for doing this, but I've been unable to track down one for Slack?  Does it exist?   I see that AddThis was able to implement a button but I'm not sure exactly how they are doing it.
Is there a URL that can be used for a Share on Slack button?
social sharing buttons;slack