Add ServerCore API documentation

dnsapi2.md

@@ -132,6 +132,7 @@
 - [208. Use EuroDNS DNS API](#dns_eurodns)
 - [209. Use DNScale DNS API](#dns_dnscale)
 - [210. Use Poweradmin DNS API](#dns_poweradmin)
+- [211. Use ServerCore DNS API](#dns_servercore)
 - [Use custom API](#dns_myapi)
 
 
@@ -3363,6 +3364,24 @@ acme.sh --issue --dns dns_poweradmin -d example.com -d "*.example.com"
 
 Report any bugs or issues here: https://github.com/acmesh-official/acme.sh/issues/6912
 
+<a name="dns_servercore"/>
+
+## 211. Use ServerCore DNS API
+You have to create service user with appropriate access rights in [ServerCore control panel](https://my.servercore.com/iam/service-users).
+More info about right can be found in [docs](https://docs.servercore.com/access-control/access-management).
+Then, you need to define following variables:
+```sh
+export SCore_Login_ID=<login_id> # login identifier
+export SCore_Project_Name="<project_name>" # project name
+export SCore_Login_Name="<username>" # username
+export SCore_Pswd="<user_password>" # password for created user
+```
+Login identifier can be found in the upper right corner of the control panel.
+After that you can issue the certificate with acme.sh, for example:
+```sh
+./acme.sh --issue --dns dns_servercore -d example.net -d *.example.net
+```
+
 ## Use custom API
 <a name="dns_myapi"/>