Added LiveKit cli.

matrix/element-call/README.md

@@ -41,7 +41,15 @@ curl -sSL https://get.livekit.io | bash
 
 You can do this as a normal user, it will use sudo to do its job.
 
-Configuring this thing is [documented
+While you're at it, you might consider installing the cli tool as well, you
+can use it -for example- to generate tokens so you can [test LiveKit's
+connectivity](https://livekit.io/connection-test):
+
+```
+curl -sSL https://get.livekit.io/cli | bash
+```
+
+Configuring LiveKit is [documented
 here](https://docs.livekit.io/home/self-hosting/deployment/). We're going to
 run LiveKit under authorization of user `turnserver`, the same users we use
 for [coturn](coturn). This user is created when installing coturn, so if you
@@ -51,7 +59,9 @@ haven't installed that, you should create the user yourself:
 adduser --system turnserver
 ```
 
-## Create a key and secret: {#keysecret}
+## Configure {#keysecret}
+
+Start by creating a key and secret:
 
 ```
 livekit-server generate-keys