feat: 在文档中添加“客户端 SDK”链接，并创建相应的客户端 SDK 文档，以支持用户在许可证管理中的安全实现

docs/en/guide/sdk.md

@@ -0,0 +1,19 @@
+# Client SDK
+
+The client SDK packages the license parsing, signature verification, and runtime health checks that every edge/desktop/embedded client needs so you don’t have to re-implement the security workflow in multiple codebases.
+
+## Quick Links
+
+- GitHub repository (README + samples + API docs): [https://github.com/cedar-v/license-manager-sdk-go](https://github.com/cedar-v/license-manager-sdk-go)
+- License structure reference: [`/en/guide/license-token-structure`](/en/guide/license-token-structure)
+
+> All hands-on content (installation, configuration, examples, changelog) lives inside the repository README so there is only one source of truth.
+
+## When to Use
+
+- Boot-time validation on standalone or edge deployments
+- Hybrid setups that exchange heartbeats with the License Manager service
+- Clients that need consistent error codes and logging for license enforcement
+
+Need a feature or found an issue? Open a discussion or issue directly in the repository to keep the conversation close to the source.
+