setup jsr publishing

[levibostian]

closes: #1

hey there! I installed this module in a deno project of mine and when I tried to publish my project to jsr, jsr blocked it saying that it does not allow publishing if I use any deno.land dependencies. So, I decided to see how hard it would be to publish this module to jsr.

I followed the official docs, created necessary files, and successfully published my fork to jsr with success using the files in this PR. It was really easy without needing to modify any source code. This PR contains all the files that I used to publish.

If you're interested in merging this in, be sure to follow these quick steps before doing so.

1. create a jsr account if you dont have one.
2. go to https://jsr.io/new > fill it out. choose @denosaurs as your scope and use commit as the name.
3. on the next screen where it tells you instructions for publishing, use the github actions option where you will type commit into the textbox asking you for the name of the github repo and click "Link" button.

Then all you should have to do is merge this PR into the main branch. The new GitHub Actions workflow should do all the publishing for you, including auth.

Thanks for creating this great module!

[eliassjogreen]

Thanks for the PR! I'll be sure to release it on JSR :)