Add sitehost.nz DNS API documentation

dnsapi2.md

@@ -128,6 +128,7 @@
 - [204. Use BEST-HOSTING DNS API](#dns_bh)
 - [205. Use Gname.com DNS API](#dns_gname)
 - [206. Use cPanel UAPI DNS](#dns_cpanel_uapi)
+- [207. Use sitehost.nz DNS API](#dns_sitehost)
 - [Use custom API](#dns_myapi)
 
 
@@ -3252,6 +3253,22 @@ The `cPanel_Username`, `cPanel_Apitoken`, `cPanel_Hostname`, and `cPanel_TTL` wi
 
 Report any bugs or issues [here](https://github.com/acmesh-official/acme.sh/issues/6877).
 
+<a name="dns_sitehost"/>
+
+## 207. Use SiteHost DNS API
+
+[SiteHost](https://www.sitehost.nz) is a New Zealand-based hosting service with API DNS management available. Your client ID is visible when logged into the [dashboard](https://cp.sitehost.nz). You can generate an API key by navigating to the `API` section of the dashboard - ensure you enable DNS access for it.
+
+```sh
+export SITEHOST_API_KEY="your_api_key"
+export SITEHOST_CLIENT_ID="your_client_id"
+
+acme.sh --issue --dns dns_sitehost -d example.com -d *.example.com`
+```
+
+The `SITEHOST_API_KEY` and `SITEHOST_CLIENT_ID` will be saved in ~/.acme.sh/account.conf and will be reused when needed.
+
+Report any bugs or issues https://github.com/acmesh-official/acme.sh/issues/6892
 
 ## Use custom API
 <a name="dns_myapi"/>