feat: Added Letter Spacing option

[mpa12]

Summary

Added Letter Spacing option

resolves #251

Type of change

• New feature (added a non-breaking change which adds functionality)

How Has This Been Tested?

• Ran tests with composer test
• Added or updated test cases to test new features

[DenverCoder1]

Looks great! Thanks for the contribution 🎉

The formatting can be fixed with composer format, but you don't need to worry about it since it can be done when merging.

Just one suggestion below

[mpa12]

@DenverCoder1 Added tooltip and removed the word "Font"

[mpa12]

Some error in "Format with Prettier"

Run EndBug/add-and-commit@v9
  with:
    message: style: Formatted code with Prettier
    default_author: github_actions
    add: .
    cwd: .
    fetch: --tags --force
    pathspec_error_handling: ignore
    push: true
    github_token: ***
Running in /home/runner/work/readme-typing-svg/readme-typing-svg
Add input parsed as single string, running 1 git add command.
> Using 'github-actions <41898[2](https://github.com/DenverCoder1/readme-typing-svg/actions/runs/9760791461/job/26940859740?pr=302#step:7:2)82+github-actions[bot]@users.noreply.github.com>' as author.
> Using "style: Formatted code with Prettier" as commit message.
Internal logs
  > Staging files...
  > Adding files...
  > No files to remove.
  > Checking for uncommitted changes in the git working tree...
  > Found 5 changed files.
  > Fetching repo...
  {
    raw: '',
    remote: null,
    branches: [],
    tags: [],
    updated: [],
    deleted: []
  }
  > Not pulling from repo.
  > Creating commit...
  {
    author: null,
    branch: 'main',
    commit: '28e0c4[3](https://github.com/DenverCoder1/readme-typing-svg/actions/runs/9760791461/job/26940859740?pr=302#step:7:3)f41a473cd8e214d42c2eda2a4d76b9652',
    root: false,
    summary: { changes: 5, insertions: 10, deletions: 28 }
  }
  > No tag info provided.
  > Pushing commit to repo...
  Error: Error: Pushing to https://github.com/mpa12/readme-typing-svg
  remote: Permission to mpa12/readme-typing-svg.git denied to github-actions[bot].
  fatal: unable to access 'https://github.com/mpa12/readme-typing-svg/': The requested URL returned error: [4](https://github.com/DenverCoder1/readme-typing-svg/actions/runs/9760791461/job/26940859740?pr=302#step:7:4)03
  
Outputs
  committed: true
  commit_long_sha: 28e0c43f41a473cd8e214d42c2eda2a4d76b96[5](https://github.com/DenverCoder1/readme-typing-svg/actions/runs/9760791461/job/26940859740?pr=302#step:7:5)2
  commit_sha: 28e0c43
  pushed: false
  tagged: false
  tag_pushed: false
Error: Error: Pushing to https://github.com/mpa12/readme-typing-svg
remote: Permission to mpa[12](https://github.com/DenverCoder1/readme-typing-svg/actions/runs/9760791461/job/26940859740?pr=302#step:7:13)/readme-typing-svg.git denied to github-actions[bot].
fatal: unable to access 'https://github.com/mpa12/readme-typing-svg/': The requested URL returned error: 403

[mpa12]

I added the token in the settings and jobs passed without errors

[DenverCoder1]

Thanks!