Add hfviewer architecture card

Embed the hfviewer architecture visualization card in README.md.

README.md

@@ -1,3 +1,11 @@
+<a href="https://hfviewer.com/HFVwr/bert-tiny-test-2?utm_source=huggingface&amp;utm_medium=embedded_model_card&amp;utm_campaign=HFVwr_bert-tiny-test-2_card" target="_blank" rel="noopener">
+  <img
+    src="https://hfviewer.com/api/card.svg?source=HFVwr%2Fbert-tiny-test-2&amp;granularity=0"
+    alt="Architecture graph for HFVwr/bert-tiny-test-2. Open in hfviewer"
+    width="100%"
+  />
+</a>
+
 ---
 license: apache-2.0
 pipeline_tag: feature-extraction
@@ -33,4 +41,4 @@ Not evaluated - it is a plumbing test model.
   <img
     width="100%"
   />
-</a>
+</a>