[Proposal] Remove or move the content about 0.1.0

0.1.0 represents a historical design and stage for NRI, but some packages related to it still appear in the main branch.

These include:
* ./examples: Plugin examples for NRI 0.1.0
* ./skel: NRI 0.1.0 running framework
* ./types: NRI 0.1.0 API package
* ./client: NRI 0.1.0 client package
* ./README-v0.1.0.md

We may be able to delete or move these packages to ensure that the latest main branch is clean.

We could:
1. Delete ./examples and ./skel. If users really need them, they can use the NRI package from the old tag.
2. Move ./README-0.1.0.md, ./types, and ./client-go to ./plugins/v010-adapter.

Or, **we don't delete anything, just move them to the ./0.1.0 directory**. I've provided a branch to demonstrate the modified effect. https://github.com/Iceber/nri/tree/move_0.1.0