add changelog file for vllm dlc (#4922)

Author: junpuf

vllm/CHANGELOG.md

@@ -0,0 +1,35 @@
+# Changelog
+
+All notable changes to vLLM Deep Learning Containers will be documented in this file.
+
+## [0.9.1] - 2025-06-13
+### Updated
+- vllm/vllm-openai version `v0.9.1`
+- EFA installer version `1.42.0`
+### Sample ECR URI
+```
+763104351884.dkr.ecr.us-east-1.amazonaws.com/0.9-gpu-py312-ec2
+763104351884.dkr.ecr.us-east-1.amazonaws.com/0.9.1-gpu-py312-cu128-ubuntu22.04-ec2
+```
+
+
+## [0.9.0.1] - 2025-06-10
+### Updated
+- vllm/vllm-openai version `v0.9.0.1`
+- EFA installer version `1.41.0`
+### Sample ECR URI
+```
+763104351884.dkr.ecr.us-east-1.amazonaws.com/0.9-gpu-py312-ec2
+763104351884.dkr.ecr.us-east-1.amazonaws.com/0.9.0-gpu-py312-cu128-ubuntu22.04-ec2
+```
+
+## [0.8.5] - 2025-06-02
+
+### Added
+- vllm/vllm-openai version `v0.8.5`
+- EFA installer version `1.40.0`
+### Sample ECR URI
+```
+763104351884.dkr.ecr.us-east-1.amazonaws.com/0.8-gpu-py312-ec2
+763104351884.dkr.ecr.us-east-1.amazonaws.com/0.8.5-gpu-py312-cu128-ubuntu22.04-ec2
+```