Added README.md

examples/app-engine/README.md

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+# Guide to run Gin under App Engine Development Server
+
+1. Download, install and setup Go in your computer. (That includes setting your $GOPATH.)
+2. Download SDK for your platform from here: https://developers.google.com/appengine/downloads?hl=es#Google_App_Engine_SDK_for_Go
+3. Download Gin source code using: $ go get github.com/gin-gonic/gin
+4. Navigate to examples folder: $ cd $GOPATH/src/github.com/gin-gonic/gin/examples/
+5. Run it: $ goapp serve app-engine/