Add a stub to expound about tags

agaric-website/tags-and-taxonomy-terms.md

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+## Tags
+
+Any content editor can create a tag, but that doesn't mean you should.
+
+Tags should be pluralized when not a typically unpluralized category.
+
+For instance, tags for a post expounding on the meaning of fast food:
+
+WRONG: "deep thought", "philosophies", "pizzas", "sandwich"  
+CORRECT: "deep thoughts", "philosophy", "pizza", "sandwiches"
+
+The reason, aside from the ontological, is that we display tags as an opportunity for people to see additional posts covering the same topics, like this:
+
+> ### More about…
+>
+> Drupal 8, Drupal Planet, and code snippets
+
+A singular "code snippet" in that list would look pretty strange.
+
+ideally, if a taxonomy term is on only one piece of content, it won't even be shown (or won't be linked).