Add cron worker example

examples/cron/.gitignore

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+target

examples/cron/Cargo.toml

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+[package]
+name = "cron-worker"
+version = "0.1.0"
+edition = "2021"
+
+[package.metadata.release]
+release = false
+
+# https://github.com/rustwasm/wasm-pack/issues/1247
+[package.metadata.wasm-pack.profile.release]
+wasm-opt = false
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+worker = { workspace = true }

examples/cron/README.md

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+# `cron-worker` on Cloudflare Workers
+
+Demonstration of using cron Worker invocation.

examples/cron/src/lib.rs

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+use worker::*;
+
+#[event(scheduled)]
+async fn scheduled(_evt: ScheduledEvent, _env: Env, _ctx: ScheduleContext) {
+    console_log!("Hello cron!");
+}

examples/cron/wrangler.toml

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+name = "cron-worker"
+main = "build/worker/shim.mjs"
+compatibility_date = "2023-03-22"
+
+[build]
+command = "cargo install worker-build && worker-build --release"
+
+[triggers]
+# Run every 5 minutes. https://developers.cloudflare.com/workers/configuration/cron-triggers/
+crons = ["*/5 * * * *"]
+
+[observability]
+enabled = true
+head_sampling_rate = 1