feeder rework

README.md

@@ -1 +1,18 @@
-# meta-feeder-wikicommons
+# meta-feeder-wikicommons
+
+Wikimedia Commons media. Open, keyless, no credential.
+
+**Upstream:** Wikimedia Commons (commons.wikimedia.org)
+**Role:** bytes
+
+A MetaMesh gateway feeder — one upstream, one job. It implements
+`FeederPlugin` from [`meta-feeder-sdk`](https://github.com/worph/meta-feeder-sdk)
+and is served over the feeder HTTP contract by `serve_feeders`.
+
+```bash
+cargo build --release --bin wikicommons-feeder
+cargo test
+```
+
+Config and scope conventions: see the SDK README and
+`docs/project-architecture/feeder-architecture.md` in the meta-root.