Update readme.md

readme.md

@@ -1,6 +1,8 @@
 Original Juniper readme moved to [juniper_readme.md](juniper_readme.md)
 
 Customize `ui/config.yml`  
+__rr__ is the router where rules will be pushed.  
+__asbr__ are routers for reporting purposes (active flows, firewall filters)  
 __At least one router of type RR has to be configured__
 
 ```yaml
@@ -14,6 +16,10 @@ routers:
   - rt2:
       type: asbr
       ip: 10.11.111.121
+vrfs:
+  # default is the base routing instance
+   - default
+   - myVRF
 ```
 
 Use Python 3 and virtualenv
@@ -27,4 +33,4 @@ python main.py
 Docker
 ```
 docker run -it --rm -p 8080:8080 -v $PWD/ui/config.yml:/srv/ui/config.yml karlnewell/i2-flowspec-portal
-```
+```