Add tensorflow (#892)

* Add TensorFlow

* fix(2003bc4): make W3C validator happier

Objection your Honor!
The offset attribute[^1] has an initial value and should not be required[^2];
but this (seems) to be SVG 2 and the W3C Validator goes up to SVG 1.1
(and the SVG 2 namespace is shared with the previous versions [^3]).

[^1]: https://svgwg.org/svg2-draft/pservers.html#StopElementOffsetAttribute
[^2]: https://www.w3.org/TR/SVG2/types.html#definitions
[^3]: https://www.w3.org/TR/SVG2/struct.html#Namespace

* Update README

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Co-authored-by: Terence Eden <edent@users.noreply.github.com>

images/reference/tensorflow.svg

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