prioritize the major missing feature

looking at readme, we migh need to prioritize the major missing feature, so we can implement them first as most important. (we can have the 3 most important one, the rest can follow-up later)

```
Major missing features:

Decode CIB attributes and status section into a Go object structure

Encode status section as JSON

Decoding / encoding configuration section

Writing changes back to the CIB

Get CIB as JSON

Get CibObjects as JSON

Make changes

Create CibObjects

Get status of resources and nodes

History information

Meta information about agents etc.

```
@krig cc

Start with the README and the listed missing capabilities in this issue. Review the Go API's current scope and the three most important gaps, then document an agreed priority order for those three features; the remaining items should be explicitly deferred.

Written by the indexing model from the issue text.