Add configuration files to build documentation on ReadTheDocs

.readthedocs.yaml

lightmotif-py/README.md

lightmotif-py/docs/Makefile

lightmotif-py/docs/api/count.rst

lightmotif-py/docs/api/encoded.rst

lightmotif-py/docs/api/index.rst

lightmotif-py/docs/api/scoring.rst

lightmotif-py/docs/api/striped.rst

lightmotif-py/docs/api/weight.rst

lightmotif-py/docs/changes.md

lightmotif-py/docs/conf.py

lightmotif-py/docs/index.rst

lightmotif-py/docs/install.rst

lightmotif-py/docs/make.bat

lightmotif-py/docs/requirements.txt