Added basic integration tests focussing on javascript

integ_tests/README.md

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+# Integration tests
+
+These tests use Playwright to run the tests agains a full Radicale instance.
+
+## First time install
+
+You need to install playwright. The easiest way to do this is to create a .venv with playwright inside. You can do this by trying to run the integ tests and then entering the .venv
+
+Assuming you use uv to run/create your .venvs, note that the invocation will fail:
+
+``` lang=shell
+uv run --extra integ_test pytest integ_tests
+source .venv/bin/activate
+```
+
+then run
+
+``` lang=shell
+playwright install --with-deps
+```
+
+## Running the tests
+
+if you use uv, you can run
+
+``` lang=shell
+uv run --extra integ_test pytest integ_tests
+```