Components - Added readme for TFX components

components/tfx/README.md

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+## Versions of TFX components that can be used with KFP SDK
+
+Disclaimer: The components in this directory are unofficial and are maintained by the KFP team not the TFX team.
+
+If you experience any issues in this components please create a new issue in the Kubeflow Pipelines repo and assign it to Ark-kun.
+
+These components were created to allow the users to use TFX components in their KFP pipelines, to be able to mix KFP and TFX components.
+
+If your pipeline uses only TFX components, please use the official [TFX SDK](https://www.tensorflow.org/tfx/tutorials/tfx/cloud-ai-platform-pipelines).
+
+See the [sample pipeline](_samples/TFX_pipeline.ipynb) which showcases most of the components.
+
+Aspects and limitations
+* These components use the official TFX container image.
+* These components run the executors and component classes of the official TFX components.
+* These components do not execute TFX [drivers](https://www.tensorflow.org/tfx/api_docs/python/tfx/components/base/base_driver), so they do not log metadata themselves (the metadata is logged by the Metadata Writer service instead). The properties of artifacts are currently not logged.
+* These components do not execute TFX launchers, so some features might be limited. For example, it's currently not possible to pass `beam_pipeline_args` which prevents some components from utilizing Google Cloud Dataflow.