Update README formatting and enhance Javadoc examples

Standardized README parameter formatting for consistency. Enhanced Javadoc in `CfDnsClient` with new example for creating subdomain records.

README.md

@@ -144,7 +144,7 @@ System.out.println("Record IP: " + record.getContent());
 Create a new DNS record in a specific zone.
 
 - **Parameters**:
-    - `ZoneEntity zone` - DNS zone object.
+  - `ZoneEntity zone` - DNS zone object.
   - `String sld` - The sub-tld of the new record.
   - `int ttl` - The time-to-live in seconds of the new rcord.
 

src/main/java/codes/thischwa/cf/CfDnsClient.java

@@ -27,11 +27,14 @@ import lombok.extern.slf4j.Slf4j;
  * // Retrieve a zone
  * ZoneEntity zone = cfDnsClient.zoneInfo("example.com");
  * System.out.println("Zone ID: " + zone.getId());
- * // Retrieve records of a zone
+ * // Retrieve records of a subdomain
  * List<{@link RecordEntity}> records = cfDnsClient.sldListAll(zone, "sld");
  * records.forEach(record ->
  *     System.out.println("Record Type: " + record.getType() + ", Value: " + record.getContent())
  * );
+ * // Creat a record for the subdomain "api"
+ * RecordEntity created = client.recordCreateSld(zone, "api", 60, RecordType.A, "192.168.1.1");
+ * System.out.println("Created Record ID: " + created.getId());
  * </code></pre>
  */
 @Setter