caicloud / nirvana / 379

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doc(openapi): openapi example readme refine (#117)

Automatic merge from submit-queue.

doc(openapi): openapi example readme refine

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

Add a refined readme for openapi.

**Which issue(s) this PR fixes** *(optional, close the issue(s) when PR gets merged)*:

Maybe https://github.com/caicloud/nirvana/issues/39

**Special notes for your reviewer**:

/cc @liubog2008 @ddysher 

**Release note**:
```release-note
NONE
```

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