docs: add README for @memtensor/memos-local-hermes-plugin (#1445)

## Summary
- Add comprehensive `README.md` for the Hermes memory plugin, adapted
from the OpenClaw plugin README
- Add `README.md` to `package.json` `files` array so it ships with npm
package

## Content
The README covers:
- Feature overview (memory engine, task summarization, skill evolution,
viewer)
- Quick start (install script, npm install, configuration)
- Bridge modes (stdio + daemon)
- Adapter documentation (Hermes + OpenHarness)
- Pipeline explanations (write, task, skill, retrieval)
- Agent tools reference
- Memory Viewer pages
- Advanced configuration
- Telemetry policy
- Project structure
- Development guide
- Troubleshooting

## Note
After merging, re-publish the npm package (e.g. `1.0.1` or
`1.0.0-beta.2`) to include the README on the npm page.

Author: syzsunshine219