Adding documentation for container source

Author: pdrake-nv

CONTAINER_SOURCE.md

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+# Container Source Notices
+
+A `NOTICES.txt` file containing a link to the open source archive for a given container can be found at `/` in both the `release` and `devel` images.
+
+Generally, source archives for each image and its tags can be found at the below links:
+
+* [TensorRT-LLM Release](https://opensource.nvidia.com/oss/teams/nvidia/release/index.html)
+* [TensorRT-LLM Develop](https://opensource.nvidia.com/oss/teams/nvidia/devel/index.html)