[web_runner_tests] Re-add README with instructions on how to run.
Test: markdown preview
Change-Id: Iae1941dca76233269c3527122fb8f031149b5c6a
diff --git a/tests/web_runner_tests/README.md b/tests/web_runner_tests/README.md
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+# `web_runner_tests`
+
+Contains integration tests to ensure that the Chromium version rolled into
+[`//topaz/tools/cipd.ensure`](../../tools/cipd.ensure) is compatible with
+Fuchsia. To run these tests, use:
+
+```
+fx set core.<board> --with //topaz/bundles:buildbot
+fx full-build
+fx reboot -r
+fx run-tests web_runner_tests
+```
+
+To run individual test suites, you can use:
+
+```
+fx run-tests web_runner_tests -t web_runner_integration_tests
+fx run-tests web_runner_tests -t web_runner_pixel_tests
+```
+
+In particular the pixel tests must be run a product without a graphical base
+shell, such as `core`.
+
+For more information about the individual tests, see their respective file
+comments.
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