Jupyter-resource-usage

- Require authentication for /metrics API Handler [18](https://github.com/jupyter-server/jupyter-resource-usage/pull/18)

- Don't poll in background, since user does not see it [15](https://github.com/jupyter-server/jupyter-resource-usage/pull/15)
- Poll instantly once page is foregrounded [15](https://github.com/jupyter-server/jupyter-resource-usage/pull/15)

This should reduce the number of /metrics requests massively, with minimal interruption to user experience.

- Automatically install & enable extensions [9](https://github.com/jupyter-server/jupyter-resource-usage/pull/9)
- Put nbextension / serverextension enables in different places
- Put nbresuse js files in appropriate path

- Change 'Mem' prefix in display to less cryptic 'Memory'
- Fix primary screenshot to show memory limit too
- Distribute static files via package_data [1](https://github.com/jupyter-server/jupyter-resource-usage/pull/1)
- Add screenshot for memory usage warning
- Configurable memory usage warnings
- More configurability via traitlets
- Consolidate code into single file
- Document memory limit behavior
- Add CONTRIBUTING.md doc
- Updated README

- Initial Commits for memory usage display