Add prompts to config

config_sentence_transformers.json

@@ -0,0 +1,12 @@
+{
+  "prompts": {
+    "paraphrase": "paraphrase: ",
+    "search_query": "search_query: ",
+    "search_document": "search_document: ",
+    "categorize_sentiment": "categorize_sentiment: ",
+    "categorize_topic": "categorize_topic: ",
+    "categorize_entailment": "categorize_entailment: "
+  },
+  "default_prompt_name": null,
+  "similarity_fn_name": null
+}