doc: add diagnostics WG session summary

2019-12-Montreal/diagnostics-session.md

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+## Diagnostics WG: status, challenges and opportunities
+
+Gireesh (@gireeshpunathil) provided a brief history
+of the diagnostic working group [ 2015 - 2019 ]
+
+Gireesh talked through the top 10 initiatives that the 
+work group is focussing on, with current status / capability,
+challenges and call for action for each initiatives being called out.
+The crux of the discussion is condensced into one line focus area.
+
+### async_hooks:
+James Snell (JS): this is used a lot in production.
+focus areas: improve performance, reduce footprint, decouple async_hook from promises
+- Call for volunteers
+new champion: Stephen Belanger (@Qaurd)
+
+### v8 tracing:
+JS: need more collaboration on covering additional components and trace points
+focus areas: more trace points, support for libuv and worker, better documentation
+- Call for volunteers
+champion: James Snell (@jasnell)
+
+--profiler:
+No action items
+
+v8 CPU profiler:
+No action items
+
+### memory debugging: heapdump
+focus areas: scalability and footprint issues
+- Call for volunteers
+champion: Matheus Marchini (@mmarchini)
+
+### memory debugging: llnode
+focus areas: Javascript API, Unified Object formatting, Node v12 compatibility
+- Call for volunteers
+champion: @mmarchini
+
+### Postmortem debugging: llnode
+focus areas: better abstractions, better documentation
+- Call for volunteers
+champion: @mmarchini, @gireeshpunathil
+
+### report:
+Anna Henningsen (AH): internal GPF handling is not necessarily
+a pre-requisite for exit experimental
+focus areas: worker support
+champion: @gireeshpunathil, Michael Dawson (@mhdawson)
+
+### best practices doc:
+focus areas: comprehensive coverage
+- Call for volunteers
+champion: @gireeshpunathil, Peter Marton (@hekike), @mhdawson
+
+### user journey based projects:
+focus areas: Align everything we do through user journeys,
+Define supported workloads and tools, and tool LTS strategy
+- Call for volunteers
+champion: @hekike, @mhdawson, @gireeshpunathil