Add general readme for translations style and questions

site/README.md

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+# Community translations
+
+Please read the
+[community translations](https://www.tensorflow.org/community/contribute/docs#community_translations)
+section in the
+[TensorFlow docs contributor guide](https://www.tensorflow.org/community/contribute/docs).
+
+General questions can be asked on the
+[docs@tensorflow.org list](https://groups.google.com/a/tensorflow.org/forum/#!forum/docs),
+and there are a few
+[language-specific docs lists](https://www.tensorflow.org/community/contribute/docs#community_translations)
+to help coordinate communities. If a language is gaining momentum and
+contributors and a new language-specific list would be useful, file
+[a GitHub issue](https://github.com/tensorflow/docs-l10n/issues).
+
+## Content
+
+The source-of-truth for technical documentation is the
+[site/en](https://github.com/tensorflow/docs/tree/master/site/en) directory in
+the [tensorflow/docs](https://github.com/tensorflow/docs/tree/master/site/en)
+repo. If, when translating, you find an issue in the source content, please send
+a separate pull request that fixes the upstream content.
+
+### Subsites
+
+Subsites are doc collections for projects outside of the *core TensorFlow* in
+the `tensorflow/docs` repo. These docs usually live with their project in a
+separate GitHub repository. For example, the docs for
+[tensorflow.org/federated](https://www.tensorflow.org/federated) live in the
+[tensorflow/federated](https://github.com/tensorflow/federated/tree/master/docs)
+GitHub repo. For translations, mirror this structure *within* this
+`tensorflow/docs-l10n` repo (i.e. do not submit translation pull requests to the
+subsite project repo).
+
+### Do not translate
+
+The following sections are *not* included in the community translations project.
+TensorFlow.org does not translate API reference, and uses an internal system for
+landing pages and release-sensitive documentation. Please do not translate the
+following sections:
+
+* The `/install/` directory.
+* API reference including `/api_docs/` and `/versions/` directories.
+* Navigation: `_book.yaml` and `_toc.yaml` files.
+* Overview pages such as `_index.yaml`, `index.html`, and `index.md`.
+
+## Style
+
+Please follow the
+[TensorFlow documentation style guide](https://www.tensorflow.org/community/contribute/docs_style)
+and the
+[Google developer docs style guide](https://developers.google.com/style/highlights),
+when applicable. Additionally, language-specific style may be agreed upon by the
+community—see the `README.md` file within a `site/<lang>/` directory. Community
+proposals and communication can take place over pull request comments or
+language-specific mailing lists (if available).
+
+To reduce diff-churn on notebook pull requests and make reviews easier, please
+use the [nbfmt](https://github.com/tensorflow/docs/blob/master/tools/nbfmt.py)
+tool or download the notebook from
+[Google Colab](https://colab.research.google.com/).