[Benchmarks] Add qwen2.5-7b test (#763)

### What this PR does / why we need it?
- Add qwen2.5-7b test
- Optimize the documentation to be more developer-friendly 

Signed-off-by: xuedinge233 <damow890@gmail.com>
Co-authored-by: xuedinge233 <damow890@gmail.com>

benchmarks/tests/serving-tests.json

@@ -22,5 +22,29 @@
       "dataset_path": "./ShareGPT_V3_unfiltered_cleaned_split.json",
       "num_prompts": 200
     }
+  },
+  {
+    "test_name": "serving_qwen2_5_7B_tp1",
+    "qps_list": [
+      1,
+      4,
+      16,
+      "inf"
+    ],
+    "server_parameters": {
+      "model": "Qwen/Qwen2.5-7B-Instruct",
+      "tensor_parallel_size": 1,
+      "swap_space": 16,
+      "disable_log_stats": "",
+      "disable_log_requests": "",
+      "load_format": "dummy"
+    },
+    "client_parameters": {
+      "model": "Qwen/Qwen2.5-7B-Instruct",
+      "backend": "vllm",
+      "dataset_name": "sharegpt",
+      "dataset_path": "./ShareGPT_V3_unfiltered_cleaned_split.json",
+      "num_prompts": 200
+    }
   }
 ]