add configuration sample file

sample.json

+{
+  "filter": {
+    "并发数": [],
+    "模型": []
+
+  },
+  "dist_cols": ["模型", "卡数"],
+  "group_cols": [["并发数"], ["输入长度(tokens)", "输出长度(tokens)"]],
+  "key_cols": ["卡型号", "vLLM版本", "V0/V1 Engine"],
+  "metric_cols": ["平均首字延时TTFT(ms)", "平均生成时间TPOT(ms)", "生成吞吐量(tokens/s)", "总吞吐量(tokens/s)"],
+  "files": [
+    {
+      "file": "t.xlsx",
+      "sheets": [],
+      "column_mapping": {"卡类型":"卡型号"
+      },
+      "column_replace": {"模型":{"Qwen3_14B":"Qwen3-14B", "Qwen3_32B":"Qwen3-32B"}
+      }
+    }
+  ]
+}