Add build status badge to README.md

Author: n-peugnet

README.md

@@ -1,8 +1,6 @@
 # [Image Map Creator](https://n-peugnet.github.io/image-map-creator/)
 
-<!--
-[![FOSSA Status](https://app.fossa.io/api/projects/git%2Bgithub.com%2Fn-peugnet%2Fimage-map-creator.svg?type=shield)](https://app.fossa.io/projects/git%2Bgithub.com%2Fn-peugnet%2Fimage-map-creator?ref=badge_shield)
---->
+[![build][build-svg]][build-url]
 
 This is a simple map creator tool made with the p5.js library. I want it
 to be easy to use for both the end user and the developper. This work is
@@ -151,7 +149,5 @@ your local machine for development and testing purposes.
 See also the list of [contributors](https://github.com/n-peugnet/image-map-creator/contributors)
 who participated in this project.
 
-<!--
-## License
-[![FOSSA Status](https://app.fossa.io/api/projects/git%2Bgithub.com%2Fn-peugnet%2Fimage-map-creator.svg?type=large)](https://app.fossa.io/projects/git%2Bgithub.com%2Fn-peugnet%2Fimage-map-creator?ref=badge_large)
--->
+[build-svg]: https://github.com/n-peugnet/image-map-creator/actions/workflows/build.yml/badge.svg
+[build-url]: https://github.com/n-peugnet/image-map-creator/actions/workflows/build.yml