a proposal for moving this project

hello, guys, this project for a rpc component with jsonrpc, and then we can create more component in this way, such as xmlrpc, pb, grpc, turbo,hprose etc, then we need create many root projects in apache org.

So, I think we need think about moving this project in two ways:
- move the rpc component to dubbo-rpc module of dubbo project
- or create a new root project incubator-dubbo-rpc-component, all new rpc component from community will be here.

How about this idea, guys?

Start with the proposal in issue #13 and review the current dubbo-rpc-jsonrpc project context. Compare the two destinations named in the issue: the dubbo-rpc module or a new incubator-dubbo-rpc-component root project. Done requires a maintainer decision on the project location and an agreed migration scope.

Written by the indexing model from the issue text.