iox-#10 Add badge to crates.io

[elBoberido]

Pre-Review Checklist for the PR Author

1. [x] Code follows the Rust coding style and is formatted with rustfmt
2. [x] Branch follows the naming format (iox-123-this-is-a-branch)
3. [x] Commits messages are according to this guideline
   • [x] Commit messages have the issue ID (iox-#42 commit text)
   • [x] Commit author matches Eclipse Contributor Agreement (and ECA is signed)
4. [x] Update the PR title
   • Follow the same conventions as for commit messages
   • Link to the relevant issue
5. [x] Relevant issues are linked
6. [x] Add sensible notes for the reviewer
7. [ ] All checks have passed (except task-list-completed)
8. [x] Assign PR to reviewer

Notes for Reviewer

Checklist for the PR Reviewer

• [ ] Commits are properly organized and messages are according to the guideline
• [ ] Code according to our coding style and naming conventions
• [ ] PR title describes the changes

Post-review Checklist for the PR Author

1. [ ] All open points are addressed and tracked via issues

References

• Relates to #10

[codecov-commenter]

Codecov Report

Merging #38 (d7f995b) into master (6cde1fc) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #38   +/-   ##
=======================================
  Coverage   36.66%   36.66%           
=======================================
  Files          15       15           
  Lines        4110     4110           
=======================================
  Hits         1507     1507           
  Misses       2603     2603           

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Continue to review full report at Codecov.

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