models : simplify the conversion script

Update download-ggml-model.sh

models : change default hosting to Hugging Face

minor : remove one more redundant line

minor : fix double float32 conversion in python script

extra : compute SHA of all models files

Added for Windows implemenated script download-ggml-model.cmd

Changes to work by default on macOS - use curl when wget is not available, and use an alternative method to get the script path when realpath is not available.

refactoring : move main + stream in examples + other stuff

Add enconding parameter to vocab.json opening to fix errors

Update README.md and finalize the whisper.wasm example

Minor

Create README.md

Adding dummy models for testing purposes

Initial release