Add a list of TWiG blog posts

[doc only]

docs/SUMMARY.md

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         - [Payload format](dev/core/internal/payload.md).
         - [Directory structure](dev/core/internal/directory-structure.md)
 - [API Documentation](api/index.md)
+- [Appendix](appendix/index.md)
+  - [This Week in Glean](appendix/twig.md)

docs/appendix/index.md

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+# Appendix
+
+The following sections contain other material related to Glean.

docs/appendix/twig.md

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+# This Week in Glean (TWiG)
+
+“This Week in Glean” is a series of blog posts that the Glean Team at Mozilla is using to try to communicate better about our work.
+They could be release notes, documentation, hopes, dreams, or whatever: so long as it is inspired by Glean.
+
+## Blog posts
+
+* 2019-10-17: [Glean on Desktop (Project FOG)](https://chuttenblog.wordpress.com/2019/10/17/this-week-in-glean-glean-on-desktop-project-fog/)
+* 2019-10-24: [A Release](https://fnordig.de/2019/10/24/this-week-in-glean/)
+* 2019-11-01: [A detective story](http://droettboom.com/blog/2019/11/01/this-week-in-glean-november-1-2019/)
+* 2019-11-08: [Instrumenting Android Crashes with Glean](https://blogoftravis.wordpress.com/2019/11/08/this-week-in-glean-2019-11-08/)
+* 2019-11-19: [GeckoView + Glean = Fenix performance metrics](https://www.a2p.it/wordpress/tech-stuff/mozilla/geckoview-glean-fenix-performance-metrics/)