Add a code block with example usage of spicedb

pages/spicedb/getting-started/protecting-a-blog.mdx

@@ -12,7 +12,15 @@ Instead of introducing an unfamiliar example app and altering various locations
 One of:
 
 - An [Authzed] Permission System and associated [API Token] with `admin` access
-- A [running instance] of [SpiceDB][SpiceDB] with the configured preshared key for SpiceDB
+- A [running instance] of [SpiceDB][SpiceDB] with the configured preshared key for SpiceDB:
+
+```bash
+# Using the binary
+spicedb serve --grpc-preshared-key "t_your_token_here_1234567deadbeef"
+
+# Using Docker
+docker run --rm -p 50051:50051 authzed/spicedb serve --grpc-preshared-key "t_your_token_here_1234567deadbeef"
+```
 
 [Authzed]: https://app.authzed.com
 [API Token]: /authzed/concepts/restricted-api-access#tokens