【bugfix】【doc】 add example · Pull Request !211 · openEuler/yuanrong

1. add example
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**What type of PR is this?**

/kind <label>

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**What does this PR do / why do we need it**:

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**Which issue(s) this PR fixes**:

Fixes #

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**Test Plan and Test result：What scenarios were tested, and what were the verification results（Function, performance, reliability, etc.）**：

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**Self-checklist**:（**请自检，在[ ]内打上x，我们将检视你的完成情况，否则会导致pr无法合入**）

+ - [ ] **设计**：PR对应的方案是否已经经过Maintainer评审，方案检视意见是否均已答复并完成方案修改
+ - [ ] **测试**：PR中的代码是否已有UT/ST测试用例进行充分的覆盖，新增测试用例是否随本PR一并上库或已经上库
+ - [ ] **验证**：PR描述信息中是否已包含对该PR对应的Feature、Refactor、Bugfix的预期目标达成情况的详细验证结果描述
+ - [ ] **接口**：是否涉及对外接口变更，相应变更已得到接口评审组织的通过，API对应的注释信息已经刷新正确
+ - [ ] **文档**：是否涉及官网文档修改，如果涉及请及时提交资料到Doc仓

类型	指派人员	状态
审查	openeuler-ci-bot luozhancheng liangyi	进行中 (0/1人)
测试	openeuler-ci-bot	进行中 (0/1人)

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