Add 'timer' api docs (#339)

docs/reference/control.md

@@ -0,0 +1,33 @@
+# Control
+
+Program controls and events.
+
+```cards
+control.millis();
+control.runInParallel(() => {
+    
+});
+control.reset();
+control.waitMicros(4);
+control.deviceSerialNumber();
+```
+
+## Timer
+
+```cards
+control.timer1.reset()
+control.timer1.pauseUntil(5)
+control.timer1.millis()
+control.timer1.seconds()
+```
+
+## Advanced #advanced
+
+```cards
+control.raiseEvent(0, 0);
+control.onEvent(0, 0, () => {
+    
+});
+control.assert(false, 0);
+control.panic(0);
+```