README: add manifest ideas

README.md

@@ -1,3 +1,36 @@
 # apig
 
 Just a small experiment in replicating the API gateway pattern for microservices.
+
+## Manifest Format
+
+```
+service printerfacts
+backend https://printerfacts.herokuapp.com
+health /index.html
+playbook_url https://github.com/Xe/printerfacts/wiki/Playbooks#healthcheck-is-down
+
+twirp (
+  public v5 us.xeserv.api.Printerfacts Fact
+)
+```
+
+```
+service ponyapi
+backend https://ponyapi.apps.xeserv.us
+health /newest
+
+prefix /ponyapi
+
+http (
+  public GET /all
+  public GET /newest
+  public GET /last_aired
+  public GET /season/:snum
+  public GET /season/:snum/episode/:enum
+  public GET /random
+  public GET /search
+  
+  private root:admin GET /_stats
+)
+```