Update install instructions for libsndfile

[cbalioglu]

Let us mention that users can (preferably) install libsndfile using their system package manager without resorting to Conda if they have sudo access.

[jborut]

Also, would someone please explain in more details how to install libsndfile and make it work? I followed this closed issue here #42 but for the life of me I can't figure out how to make it work.

[skanda1005]

Try using a python venv and then apt-get libsndfile1

python3 -m venv <env-name>
source <env-name>/bin/activate
pip install .
apt-get install -y libsndfile1