Add a link to android blog post (#6296)

Author: wing328

README.md

@@ -745,6 +745,7 @@ Here are some companies/projects (alphabetical order) using OpenAPI Generator in
 - 2020-03-15 - [Load Testing Your API with Swagger/OpenAPI and k6](https://k6.io/blog/load-testing-your-api-with-swagger-openapi-and-k6)
 - 2020-04-13 - [俺的【OAS】との向き合い方 (爆速でOpenAPIと友達になろう)](https://tech-blog.optim.co.jp/entry/2020/04/13/100000) in [OPTim Blog](https://tech-blog.optim.co.jp/)
 - 2020-04-22 - [Introduction to OpenAPI Generator](https://nordicapis.com/introduction-to-openapi-generator/) by [Kristopher Sandoval](https://nordicapis.com/author/sandovaleffect/) in [Nordic APIs](https://nordicapis.com/)
+- 2020-05-09 - [OpenAPIでお手軽にモックAPIサーバーを動かす](https://qiita.com/kasa_le/items/97ca6a8dd4605695c25c) by [Sachie Kamba](https://qiita.com/kasa_le)
 
 ## [6 - About Us](#table-of-contents)