slightly better docs

README.md

@@ -1,11 +1,28 @@
 Requestbin
 ==========
 
-https://github.com/Runscope/requestbin
+Starts a [requestbin](https://github.com/Runscope/requestbin) server on port
-
+80.
-https://registry.hub.docker.com/u/goldeneggg/centos-requestbin/
-1.503 GB
 
 
-https://registry.hub.docker.com/u/agaveapi/requestbin/
+Usage
-not a verified docker image
+-----
+
+This app is designed to work in conjunction with Redis. There's an example in
+the Makefile that looks like:
+
+    docker run -d --name requestbin_redis redis
+    docker run -d --name requestbin \
+      --link requestbin_redis:redis \
+      -e REDIS_URL=redis://redis:6379/0 \
+      requestbin
+
+
+Prior Art
+---------
+
+[goldeneggg/centos-requestbin](https://registry.hub.docker.com/u/goldeneggg/centos-requestbin/):
+This image is 1.503 GB, compared to 174 MB for mine.
+
+[agaveapi/requestbin](https://registry.hub.docker.com/u/agaveapi/requestbin/):
+Not a verified Docker image.