Add a news item for Unknowns coverage update

src/docs/news.PomBase/2024-07-10-unknowns-coverage-update.md

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+### "Unknowns" coverage update
+<!-- pombase_flags: frontpage -->
+<!-- newsfeed_thumbnail: pombase-logo-32x32px.png -->
+
+In our 2019 work,
+["Hidden in plain sight: What Remains to be discovered in the eukaryotic proteome?"](https://royalsocietypublishing.org/doi/10.1098/rsob.180241),
+we demonstrated that *S. pombe* had a higher GO biological process (BP)
+annotation coverage (86.7%) than both *S. cerevisiae* (83.5%) and human
+(82.8%). 
+
+Of the model eukaryotes S. pombe has:
+
+  1. The highest percentage known coverage
+  2. The fewest phylum-specific proteins
+  3. The smallest proteome (despite a higher number of genes conserved in
+     metazoa than S. cerevisiae)
+  4. Dedicated efforts to uncover unknown functions
+
+and is uniquely positioned to be the first eukaryote for which we know
+the process or pathway for every protein
+
+The trend we identified continues to hold (*S. pombe* “knowns” have
+increased to 86.9% in 2024). The coverage is confirmed by the
+[Rhee lab GO overview](https://genomeannotation.rheelab.org/#!/overview):
+
+[![Rhee lab unknowns coverage](assets/newsfeed/Rhee_lab_unknowns_coverage.png "Rhee lab unknowns coverage"){.screenshot width=100%}](assets/newsfeed/Rhee_lab_unknowns_coverage.png)
+