add infoxlm config

unilm/infoxlm/infoxlm-roberta-config.json

@@ -0,0 +1,16 @@
+{
+    "attention_probs_dropout_prob": 0.1,
+    "hidden_act": "gelu",
+    "hidden_dropout_prob": 0.1,
+    "hidden_size": 768,
+    "initializer_range": 0.02,
+    "intermediate_size": 3072,
+	"layer_norm_eps": 1e-12,
+    "max_position_embeddings": 512,
+	"model_type": "bert",
+    "num_attention_heads": 12,
+    "num_hidden_layers": 12,
+	"pad_token_id": 0,
+    "type_vocab_size": 2,
+    "vocab_size": 250002
+}