Document URL params and app startup workflow (#77)

studio-frontend/README.md

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+# studio-frontend
+
+This is the primary microfrontend to be embedded in the [Storyteller.ai
+website](https://fakeyou.com/studio).
+
+### Running
+
+The project can be served locally using the `serve` target:
+```sh
+npx nx serve studio-frontend
+```
+
+### Configuring application startup
+
+After running the `serve` command above, the web app can be viewed in the
+browser at `http://localhost:4200` and configured through a set of URL
+parameters which are documented [here](../studio-web/src/lib/url-params.ts).
+
+For example, to load the bundled `sample-room.gltf` scene in `StudioMode.Editor`,
+visit: http://localhost:4200/?mode=studio&objectId=sample-room.gltf