Added instructions for usage

docs/README.md

@@ -0,0 +1,14 @@
+
+## Usage
+For generating the documents localy use commands below from the root folder. 
+
+```shell
+# install dependencies
+pip install Sphinx sphinxcontrib-fulltoc sphinx_bootstrap_theme
+
+# generate rst files for ladybug modules except for euclid
+sphinx-apidoc -f -e -d 4 -o ./docs ./ladybug ./ladybug/euclid.py
+
+# build the documentation under _build/docs folder
+sphinx-build -b html ./docs ./docs/_build/docs
+```