New Code Example : Forward-Forward Algorithm for Image Classification (#1170)

* added ForwardForward py file example for PR review

Signed-off-by: Suvaditya Mukherjee <[email protected]>

* added changes as per Francois's comments

Signed-off-by: Suvaditya Mukherjee <[email protected]>

* Copyedits

* added small final edits and generated files

Signed-off-by: Suvaditya Mukherjee <[email protected]>

Signed-off-by: Suvaditya Mukherjee <[email protected]>
Co-authored-by: François Chollet <[email protected]>

Author: suvadityamuk