update readme, add starcoder2, cosmopedia

Former-commit-id: 1ae7c183640146bb9b06c98942985a1721d2b9c9

data/dataset_info.json

@@ -220,6 +220,13 @@
     "ms_hub_url": "AI-ModelScope/WizardLM_evol_instruct_V2_196k",
     "formatting": "sharegpt"
   },
+  "cosmopedia": {
+    "hf_hub_url": "HuggingFaceTB/cosmopedia",
+    "columns": {
+      "prompt": "prompt",
+      "response": "text"
+    }
+  },
   "oasst_de": {
     "hf_hub_url": "mayflowergmbh/oasst_de"
   },
@@ -368,4 +375,4 @@
     },
     "folder": "python"
   }
-}
+}