Add SIG Node archive README

This adds a README file to the archive logs to serve as an easy landing
page when reading through the archive information.

Signed-off-by: Sean McGinnis <[email protected]>

Author: stmcginnis

sig-node/archive/README.md

@@ -0,0 +1,16 @@
+# SIG Node Historical Meeting Notes
+
+This contains the historical archives from the SIG Node meetings.
+
+Current active meeting notes can be found in the working document used by the
+SIG. For links to this document, and for current meeting details, please refer
+to the [SIG Node README](../README.md) for details.
+
+## Meeting Archives
+
+* [2020](meeting-notes-2020.md)
+* [2019](meeting-notes-2019.md)
+* [2018](meeting-notes-2018.md)
+* [2017](meeting-notes-2017.md)
+* [2016](meeting-notes-2016.md)
+* [2015](meeting-notes-2015.md)