田欧 98082fd590 document: add docs dir and middleware document (#1521) ...

* init docs dir

* add middleware document

* fix indent

* update docs

2018-10-15 13:01:44 +08:00

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how-to-build-an-effective-middleware.md

document: add docs dir and middleware document (#1521)

2018-10-15 13:01:44 +08:00