add image widget documentation

[hilpitome]

IMPORTANT: Where possible all PRs must be linked to a Github issue

Fixes #[issue number] or Closes #[issue number]

Engineer Checklist

• I have written Unit tests for any new feature(s) and edge cases for bug fixes
• I have added any strings visible on UI components to the strings.xml file
• I have updated the CHANGELOG.md file for any notable changes to the codebase
• I have run ./gradlew spotlessApply and ./gradlew spotlessCheck to check my code follows the project's style guide
• I have built and run the FHIRCore app to verify my change fixes the issue and/or does not break the app
• I have checked that this PR does NOT introduce breaking changes that require an update to Content and/or Configs? If it does add a sample here or a link to exactly what changes need to be made to the content.

Code Reviewer Checklist

• I have verified Unit tests have been written for any new feature(s) and edge cases
• I have verified any strings visible on UI components are in the strings.xml file
• I have verifed the CHANGELOG.md file has any notable changes to the codebase
• I have verified the solution has been implemented in a configurable and generic way for reuseable components
• I have built and run the FHIRCore app to verify the change fixes the issue and/or does not break the app

[codecov]

Codecov Report

Merging #2497 (fdcb0b4) into main (2ea8fa1) will decrease coverage by 0.1%.
The diff coverage is 65.2%.

@@            Coverage Diff            @@
##              main   #2497     +/-   ##
=========================================
- Coverage     64.8%   64.8%   -0.1%     
- Complexity    1050    1060     +10     
=========================================
  Files          209     210      +1     
  Lines         9156    9149      -7     
  Branches      1805    1796      -9     
=========================================
- Hits          5942    5937      -5     
- Misses        2059    2060      +1     
+ Partials      1155    1152      -3     

Flag	Coverage Δ
engine	72.8% <65.2%> (-0.3%)	⬇️
geowidget	63.2% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ine/configuration/view/ViewPropertiesSerializer.kt	25.0% <0.0%> (-1.4%)	⬇️
...e/engine/ui/bottomsheet/RegisterBottomSheetView.kt	51.2% <0.0%> (-2.5%)	⬇️
...g/smartregister/fhircore/quest/QuestApplication.kt	44.2% <ø> (+0.8%)	⬆️
...artregister/fhircore/quest/ui/main/AppMainEvent.kt	100.0% <ø> (ø)
...egister/fhircore/quest/ui/main/AppMainViewModel.kt	75.0% <ø> (+0.5%)	⬆️
...ter/fhircore/quest/ui/main/components/AppDrawer.kt	70.2% <ø> (+1.4%)	⬆️
...egister/fhircore/quest/ui/profile/ProfileScreen.kt	49.7% <ø> (+0.2%)	⬆️
...re/quest/ui/questionnaire/QuestionnaireActivity.kt	56.8% <ø> (+0.9%)	⬆️
...e/quest/ui/questionnaire/QuestionnaireViewModel.kt	76.3% <ø> (-1.3%)	⬇️
...ter/fhircore/quest/ui/register/RegisterFragment.kt	30.4% <ø> (+1.0%)	⬆️
... and 25 more

... and 1 file with indirect coverage changes