add dream, webpack and atd example

[leoancap]

Pull Request Checklist

Before you submit your pull request with a new example, please make sure you have completed the following tasks:

• Update Makefile: Make sure the new example is included in the following Makefile commands:

  • install
  • build
  • test
  • clean

• Update opam file: Ensure the new example is added to the list of dependencies in the opam file.

• Update README: Add a link to the new example in the README. Provide a brief description if necessary.

Description

Please replace this section to provide a brief description of the example you are creating with this pull request.

Additional Notes

Add any additional information or notes here.

[jchavarri]

Thanks! Could you update the Makefile and melange-examples.opam files to make sure the new example is built? Similar to what was done in 7736c77.