docs: add READMEs to roles powerdns_tsig_key and dns

roles/dns/README.md

@@ -0,0 +1,33 @@
+# `finallycoffee.base.dns` ansible role
+
+Simple role for wrapping around the
+[`famedly.dns.update`](https://github.com/famedly/ansible-collection-dns/blob/main/plugins/modules/update.py)
+ansible module.
+
+## Usage
+
+### Example playbook
+```yaml
+- target: "{{ target_hosts }}"
+  roles:
+    - role: finallycoffee.base.dns
+      vars:
+        dns_server: "dns.example.org"
+        dns_zone: "zone.example.org"
+        dns_records: "{{ dns_records }}"
+        dns_record_state: exact
+        dns_tsig_name: "mykeyname"
+        dns_tsig_algo: "hmac-sha256"
+        dns_tsig_key: "mykeycontent"
+  vars:
+    dns_records:
+      - type: A
+        name: gitea
+        content: "127.0.0.1"
+      - type: AAAA
+        name: gitea
+        content: "fe80::1"
+      - type: CNAME
+        name: "_acme_challenge.gitea"
+        content: "delegated-cname.challenge.example.org"
+```