engine: resources: cron: Add lang examples

examples/lang/cron0.mcl

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+cron "purpleidea-oneshot" {
+    session => true,
+    trigger => "OnBootSec",
+    time => "60",
+}
+
+svc "purpleidea-oneshot" {
+    session => true,
+}

examples/lang/cron1.mcl

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+cron "purpleidea-oneshot" {
+    state => "absent",
+}

examples/lang/cron2.mcl

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+cron "purpleidea-oneshot" {
+    trigger => "OnUnitActiveSec",
+    time => "2minutes",
+}
+
+svc "purpleidea-oneshot" {}
+
+file "/etc/systemd/system/purpleidea-oneshot.service" {}

examples/lang/cron3.mcl

@@ -0,0 +1,13 @@
+$home = getenv("HOME")
+
+cron "purpleidea-oneshot" {
+    session => true,
+    trigger => "OnCalendar",
+    time => "*:*:0",
+}
+
+svc "purpleidea-oneshot" {
+    session => true,
+}
+
+file printf("%s/.config/systemd/user/purpleidea-oneshot.service", $home) {}