README needs to make scope and project goals clearer

[erik-brangs]

The contributing guidelines mention that language server will enable developers to

develop cloud-native applications using the Jakarta EE APIs

and the focus is currently seems to be on web-profile. What's the plan for the future? Will support center on the core profile?

Is support for full profile in scope? Will there be separate components for that? What about optional specifications? Hypothetical example: if someone insisted on adding support for unpopular specifications (e.g. JAX-WS or Batch), how would you deal with that?

Those question should be answered by the README (or another place linked from there).