Update bull readme

packages/bull/readme.md

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+# zemble-plugin-bull
+
+This is still a WIP and breaking changes can occur. The design goal is to provide a generic interface to specify queues that is not tied to Bull. It's close, but for speed of implementation there are some Bull specific types in there still.
+
+This is a plugin for Zemble to easily set up queues. It's based on Bull and requires Redis (set REDIS_URL or configure it in the plugin options).
+
+It automatically processes /queues directories. For typesafety and wiring it all up export a ZembleQueue. It just exposes a worker callback and some configuration that is completely optional (for example if you want the job to be processed recurringly).
+
+Optionally it exposes GraphQL queries to manage and monitor the jobs.