Update README How to use

README.md

@@ -12,4 +12,21 @@ TashTalk could be a stretch goal, if I can acquire one!
 
 ## How to use
 
-It's not ready yet. Come back later.
+WARNING: It Barely Works™
+
+First, set up a `jrouter.yaml` (use the one in this repo as an example).
+
+TODO: explain the configuration file
+
+Building and running:
+
+```shell
+go install gitea.drjosh.dev/josh/jrouter@latest
+sudo setcap 'CAP_NET_BIND_SERVICE=ep CAP_NET_RAW=ep' ~/go/bin/jrouter
+~/go/bin/jrouter
+```
+
+* `NET_BIND_SERVICE` is needed to bind UDP port 387 (for talking between AIRs)
+* `NET_RAW` is needed for EtherTalk
+
+TODO: instructions for non-Linux machines