Add working model

.gitmodules

src/hardware/sign_model.c

src/hardware/sign_model.h

src/pc/.gitignore

src/pc/requirements.txt

src/pc/sign_language_detector.ipynb

src/pc/sign_model.c

src/pc/sign_model.h

src/pc/sign_model.keras

src/pc/sign_model.tflite