Dedicated README for lambda_http

[calavera]

The README that we add to lambda_http when we publish the crate is the same as we use for the runtime. This readme is too generic to be useful to users. We should create a new README specific for lambda_http that talks about the features in this crate, and how to use it, instead of the generic runtime.

[ymwjbxxq]

Hello David,

I can take care of this by also adding examples at the same time.
With the excuse, I will learn something.

[github-actions]

⚠️COMMENT VISIBILITY WARNING⚠️

Comments on closed issues are hard for the maintainers of this repository to see.
If you need more assistance, please open a new issue that references this one.
If you wish to keep having a conversation with other community members under this issue feel free to do so.