Add basic demo SPA to display claims

example/demo/README.md

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+# Demo Single Page Application for the OIDC IdP
+
+This demo's purpose is to display the claims that are shared with Relying
+Parties. It is currently deployed at https://demo-oidc.login.xyz.
+
+## Dependencies
+
+```sh
+$ cargo install trunk
+$ rustup target add wasm32-unknown-unknown
+```
+
+## Development
+
+```sh
+trunk serve --open
+```
+
+## Deploy
+
+```sh
+cp wrangler_example.toml wrangler.toml
+```
+And fill in `account_id` and `zone_id`.
+
+```sh
+$ source .env
+$ trunk build
+$ wrangler publish
+```