Document communication touch points between LoopBack and OpenJSF/LF

[achrinza]

• Linux Foundation Issue Tracker (https://members.openjsf.org/ or https://support.linuxfoundation.org)
  see: Update contact methods for requesting help openjs-foundation/cross-project-council#856
• OpenJSF Slack #at-large-project-maintainers

Unconfirmed:

• OpenJSF Code of Conduct Panel (CoCP)