chore: add test coverage (#4960)

platform/docs/docs/test-coverage.md

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+---
+sidebar_position: 14
+sidebar_label: Test Coverage
+---
+
+# Test Coverage
+
+## Playwright
+
+
+Here's the test coverage report for our Playwright tests. Keep in mind that this doesn't include our Cypress tests, so our actual test coverage is likely higher than what's shown. We're focusing on Playwright for future OHIF testing, and we're really pushing to improve that coverage number.
+
+
+You can view our latest test coverage report here:
+- [OHIF Playwright Test Coverage Report](https://docs.ohif.org/coverage)

platform/docs/docs/user-guide/viewer/mpr.md

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+# Multiplanar Reconstruction
+
+
+## Crosshairs
+
+
+<div style={{padding:"56.25% 0 0 0", position:"relative"}}>
+    <iframe width="560" height="315" src="https://www.youtube.com/embed/Qe3j6I-RdlA?si=UejPdGNSSZBS66qE" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>
+</div>
+
+
+
+# MPR Slab Oblique
+
+<div style={{padding:"56.25% 0 0 0", position:"relative"}}>
+    <iframe src="https://player.vimeo.com/video/843233906?badge=0&amp;autopause=0&amp;player_id=0&amp;app_id=58479" frameBorder="0" allow="autoplay; fullscreen; picture-in-picture" allowFullScreen style= {{ position:"absolute",top:0,left:0,width:"100%",height:"100%"}} title="measurement-report"></iframe>
+</div>