Add "sentence-transformers" library name

Hello!

## Pull Request overview
- Add "sentence-transformers" library name

## Details
This allows the model to be found more easily, for HF to put the correct "Use with Model" suggestions, for MTEB to consider this model as "Sentence Transformers compatible", and for the inference API widget to work nicely (though that one might already work fine with Feature Extraction).

- Tom Aarsen

README.md

@@ -9,33 +9,34 @@ language:
 model-index:
 - name: Solon-embeddings-base-0.1
   results:
-    - task:
-        type: sentence-similarity
-        name: Passage Retrieval
-      dataset:
-        type: unicamp-dl/mmarco
-        name: mMARCO-fr
-        config: french
-        split: validation
-      metrics:
-        - type: recall_at_500
-          name: Recall@500
-          value: 90.9
-        - type: recall_at_100
-          name: Recall@100
-          value: 80.6
-        - type: recall_at_10
-          name: Recall@10
-          value: 52.5
-        - type: map_at_10
-          name: MAP@10
-          value: 27.4
-        - type: ndcg_at_10
-          name: nDCG@10
-          value: 33.5
-        - type: mrr_at_10
-          name: MRR@10
-          value: 27.9
+  - task:
+      type: sentence-similarity
+      name: Passage Retrieval
+    dataset:
+      type: unicamp-dl/mmarco
+      name: mMARCO-fr
+      config: french
+      split: validation
+    metrics:
+    - type: recall_at_500
+      name: Recall@500
+      value: 90.9
+    - type: recall_at_100
+      name: Recall@100
+      value: 80.6
+    - type: recall_at_10
+      name: Recall@10
+      value: 52.5
+    - type: map_at_10
+      name: MAP@10
+      value: 27.4
+    - type: ndcg_at_10
+      name: nDCG@10
+      value: 33.5
+    - type: mrr_at_10
+      name: MRR@10
+      value: 27.9
+library_name: sentence-transformers
 ---
 
 # Solon Embeddings — Base 0.1