Add example for touchPerform

[christian-bromann]

Proposed changes

Added an example for touchPerform.

Closes #4968

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Checklist

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)
• I have added proper type definitions for new commands (if appropriate)

Further comments

Reviewers: @webdriverio/technical-committee

[codecov]

Codecov Report

Merging #5004 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #5004   +/-   ##
=======================================
  Coverage   99.41%   99.41%           
=======================================
  Files         210      210           
  Lines        5509     5509           
  Branches     1180     1180           
=======================================
  Hits         5477     5477           
  Misses         29       29           
  Partials        3        3

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[christian-bromann]

@erwinheitzman added missing vars, please let me know if anything else is missing

[erwinheitzman]

LGTM