Add feature/instructions to install from source

[cleong110]

I was trying to access the new features from the latest PRs, and gave installing from source a try.

Attempting to install from the .git causes an error:

pip install "git+https://github.com/sign-language-processing/pose.git"
Collecting git+https://github.com/sign-language-processing/pose.git
  Cloning https://github.com/sign-language-processing/pose.git to /tmp/pip-req-build-9auytf2j
  Running command git clone --filter=blob:none --quiet https://github.com/sign-language-processing/pose.git /tmp/pip-req-build-9auytf2j
  Resolved https://github.com/sign-language-processing/pose.git to commit d384d887ff4abaecec7f70fce9ad11b6a05aab94
  Running command git submodule update --init --recursive -q
ERROR: git+https://github.com/sign-language-processing/pose.git does not appear to be a Python project: neither 'setup.py' nor 'pyproject.toml' found.

It is instead necessary to do something like:

conda create -n pose python=3.10 # otherwise you get latest python, which means no mediapipe!
pip install git+https://github.com/sign-language-processing/pose.git@master#subdirectory=src/python vidgear mediapipe psutil
# then you get the latest version of videos_to_poses

It seems like it would be nice to have this in the README, or a better method if there is one.

[cleong110]

Note that the command above did not seem to work. I got errors with the pose_pipelines submodule. What does work is manually cloning, navigating to the pose/src/python subdir, and then doing pip install -e .

[AmitMY]

hmmmm what i do is:

git clone https://github.com/sign-language-processing/pose.git
pip install ./pose/src/python

I don't know if there's a way to do it with a single command.

[cleong110]

Update: Tried a few things while trying to solve #174, no luck with the source install. https://colab.research.google.com/drive/1Dy9hy5NcF1cL6ndyQj-9smhxbAanbJ46#scrollTo=exVCYF3YWSeE

Seems like manually cloning and installing is still the way to go for now.