Adds release notes for 2.16 #1281

Job	Run time
Build and Test geospatial Plugin (11, windows-latest)	3m 50s
Build and Test geospatial Plugin (11, windows-latest)	3m 50s
Build and Test geospatial Plugin (11, macos-latest)	7m 43s
Build and Test geospatial Plugin (11, macos-latest)	7m 43s
Build and Test geospatial Plugin (17, windows-latest)	3m 53s
Build and Test geospatial Plugin (17, windows-latest)	3m 53s
Build and Test geospatial Plugin (17, macos-latest)	8m 42s
Build and Test geospatial Plugin (17, macos-latest)	8m 42s
Build and Test geospatial Plugin (21, windows-latest)	3m 46s
Build and Test geospatial Plugin (21, windows-latest)	3m 46s
Build and Test geospatial Plugin (21, macos-latest)	7m 43s
Build and Test geospatial Plugin (21, macos-latest)	7m 43s
Get-CI-Image-Tag / Get-CI-Image-Tag	5s
Get-CI-Image-Tag / Get-CI-Image-Tag	5s
Build and Test geospatial Plugin (11)	3m 53s
Build and Test geospatial Plugin (11)	4m 12s
Build and Test geospatial Plugin (17)	3m 59s
Build and Test geospatial Plugin (17)	8m 33s
Build and Test geospatial Plugin (21)	4m 0s
Build and Test geospatial Plugin (21)	4m 6s
	1h 40m 7s

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