Add top level changelog, linking to cardano-cli one

[carbolymer]

Changelog

- description: |
     Add top level changelog symlink, linking to cardano-cli
# uncomment types applicable to the change:
  type:
  # - feature        # introduces a new feature
  # - breaking       # the API has changed in a breaking way
  # - compatible     # the API has changed but is non-breaking
  # - optimisation   # measurable performance improvements
  # - refactoring    # QoL changes
  # - bugfix         # fixes a defect
  # - test           # fixes/modifies tests
   - maintenance    # not directly related to the code
  # - release        # related to a new release preparation
  # - documentation  # change in code docs, haddocks...

Context

Fixes #769

Checklist

• [ ] Commit sequence broadly makes sense and commits have useful messages
• [ ] New tests are added if needed and existing tests are updated. See Running tests for more details
• [ ] Self-reviewed the diff

[smelc]

Will this work for users that clone the repo on Windows?

[carbolymer]

@smelc Usually no, unless you enable some options https://stackoverflow.com/questions/5917249/git-symbolic-links-in-windows/59761201#59761201 😵