Filled out README

README.md

@@ -1,3 +1,24 @@
 # oada-ensure #
 
-Ensures that things happen in other documents in response to document changes (i.e. re-indexing, copying, linking, etc.)
+A microservice to ensure that things happen in other documents in response to document changes (i.e. re-indexing, copying, linking, etc.).  It currently uses oada-jobs as the means by which it gets its directions.
+
+The only current task it performs is to create a link in any children linked from a virtual document 
+at /bookmarks/trellisfw/documents back to the main virtual document parent.  It stores the link in the child at `_meta/vdoc`
+
+## Installation
+```bash
+cd /path/to/your/oada-srvc-docker
+cd services-available
+git clone [email protected]:OADA/oada-ensure.git
+cd ../services-enabled
+ln -s ../services-available/oada-ensure .
+```
+
+## Overriding defaults for production
+`z_tokens` docker-compose.yml entry:
+```docker-compose
+  oada-ensure:
+    environment:
+      - token=atokentouseinproduction
+      - domain=https://your.oada.domain
+```