[Blog] Enabling users to support other content types

[dhmlau]

Description / Steps to reproduce / Feature proposal

PR #1936 enables users to support other content type. Documentation https://github.com/strongloop/loopback-next/blob/master/docs/site/Parsing-requests.md#specify-custom-parser-by-controller-methods is in place.

It would be helpful if there's a blog around this topic:

• how users can modify at controller level to support other content types
• the complexity involved around for us to provide generic file upload method, and users might have different use cases

cc @raymondfeng

[dhmlau]

https://github.com/strongloop/strongloop.com/pull/172 is ready to be published. Closing this as done