🥕 [docs] write an announcement blurb for Slack (#51)

* 🥕 [docs] write an announcement blurb for Slack

* shorten announcement

Author: chicks-net

docs/Slack_announcement.md

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+# CoreDNS + DNSControl Example Repository
+
+Hey folks! 👋
+
+Just wanted to share a repo that demonstrates managing DNS zones using DNSControl and serving them with CoreDNS.
+
+**What is it?**
+Define DNS records in JavaScript (using DNSControl) and automatically generate BIND zone files that CoreDNS serves. Think "infrastructure as code" but for DNS.
+
+**Why might you care?**
+
+- Tired of manually editing zone files
+- Want version control for DNS configurations
+- Need to test DNS setups locally before deploying
+
+**What's included:**
+Example configs, containerized CoreDNS setup, and justfile commands for the full workflow (preview, generate, build/run).
+
+**Quick start:**
+Run `just preview` to see DNS changes, then `just run_con` to spin up a local DNS server. Query it with dig.
+
+Check it out: <https://github.com/fini-net/fini-coredns-example>
+
+Happy to answer questions!