[Docs] optimize and supplement docs system (#86)

Signed-off-by: Gaohan123 <gaohan19@huawei.com>

docs/examples/README.md

@@ -0,0 +1,6 @@
+# Examples
+
+vLLM-Omni's examples are split into two categories:
+
+- If you are using vLLM-Omni from within Python code, see the *Offline Inference* section.
+- If you are using vLLM-Omni from an HTTP application or client, see the *Online Serving* section.