Add strfry doc draft

doc/integrations/strfry.md

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+# strfry (nostr relay)
+
+## LDAP policy
+
+...
+
+## Useful scripts
+
+### Syncing events for all local nostr users from a remote relay
+
+You can sync all events of all local users with a pubkey stored in LDAP from a
+specified remote relay to the local relay with the `strfry-sync.ts` script:
+
+    deno run -A /opt/strfry-sync.ts wss://relay.example.com
+
+Doing the same with Docker Compose (great for seeding data to your local relay
+in development):
+
+    docker compose run strfry deno run -A /opt/strfry-sync.ts wss://relay.example.com
+
+## Docker image
+
+In order to use the LDAP policy with Docker, you will need
+[Deno](https://deno.com/) installed in your strfry container. We provide a
+custom Docker image for strfry with Deno included (which we use in
+development):
+
+* Registry: https://gitea.kosmos.org/kosmos/-/packages/container/strfry-deno/1.1.1
+* Source: https://github.com/raucao/strfry/blob/docker_deno/ubuntu.Dockerfile