add scheduling docs

docs/schedule.md

@@ -0,0 +1,52 @@
+Scheduling a Kiln Run
+=====================
+
+Our lives are busy. Sometimes you'll want your kiln to start at a scheduled time. This is really easy to do with the **at** command.
+
+
+## Install the scheduler
+
+This installs and starts the **at** scheduler.
+
+    sudo apt-get update
+    sudo apt-get install at
+
+### Verify Time Settings
+
+Verify the date and time and time zone are right on your system...
+
+    date
+
+    Fri 04 Nov 2022 01:01:14 PM EDT
+
+If yours looks right, proceed to Examples. If not, you need to execute commands to set it. On a raspberry-pi, this is easiest by running
+
+    sudo raspi-config
+
+Localisation Options -> Timezone -> Pick one -> Ok
+
+
+## Examples
+
+Start a biscuit firing at 5am tomorrow morning...
+
+    at 5:00am friday <<END
+    curl -d '{"cmd":"run", "profile":"cone-05-long-bisque"}' -H "Content-Type: application/json" -X POST http://0.0.0.0:8081/api
+    END
+
+Start a glaze firing in 15 minutes and start a kiln watcher...
+
+    at now +15 minutes <<END
+    curl -d '{"cmd":"run", "profile":"cone-6-long-glaze"}' -H "Content-Type: application/json" -X POST http://0.0.0.0:8081/api
+    source ~/kiln-controller/venv/bin/activate; ~/kiln-controller/watcher.jbruce.py
+    END
+
+List scheduled jobs...
+
+    atq
+
+Remove scheduled jobs...
+ 
+    atrm jobid
+
+where jobid is an integer that came from the atq output