Langumo

We update a new documentation! There is no any functional updates.

New Features
- Add new documentation and docstrings to the modules and classes!

Fixed
- Fix wrong return type of `AuxiliaryFile.opens` which is a context manager.

Changed
- Change the name of the container class `BuildPipeline` to `Sequential` and move to `langumo.building.miscellaneous` package.
- Change the name of the parser `EscapedJSONStringParser` to `EscapedStringParser` for clarity.

Trivial updates!

Fixed
* Change to download the required resources for `langumo.utils.SentenceSplitter` in main process.

Changed
* Beautify `README.md`.

First release! Note that the details of package can be changed in next versions.

First release. Just for registering to PyPI repository.