[FLINK-17422] Create user document for the external resource framewor…

[KarmaGYZ]

…k and the GPU plugin

What is the purpose of the change

Create user document for the external resource framework and the GPU plugin

Brief change log

Create user document for the external resource framework and the GPU plugin

Verifying this change

Manually build the user doc.

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): no
• The public API, i.e., is any changed class annotated with @Public(Evolving): no
• The serializers: no
• The runtime per-record code paths (performance sensitive): no
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn/Mesos, ZooKeeper: no
• The S3 file system connector: no

Documentation

• Does this pull request introduce a new feature? no
• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)

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Last check on commit 6676085 (Tue Jun 09 04:08:27 UTC 2020)

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[tillrohrmann]

Thanks for creating this PR @KarmaGYZ. I had few minor comments. Please ping me once you have them resolved. Once they are resolved, I will merge this PR.

[tillrohrmann]

Maybe add a link to https://github.com/apache/flink/blob/master/flink-examples/flink-examples-streaming/src/main/java/org/apache/flink/streaming/examples/gpu/MatrixVectorMul.java as an example how to use the GPUs.

[KarmaGYZ]

Thanks for the review @tillrohrmann ! I've updated the PR.

[tillrohrmann]

Thanks for addressing my comments @KarmaGYZ. LGTM. Merging this PR now.