add docs

docs/Makefile

@@ -0,0 +1,18 @@
+# Makefile for Sphinx documentation
+# sphinx (one of): pip install sphinx, pacman -S python-sphinx
+
+SPHINXOPTS  ?=
+SPHINXBUILD ?= sphinx-build
+SOURCEDIR    = src
+BUILDDIR     = _build
+
+# first-target, will also run without arguments (like: make help).
+help:
+	@$(SPHINXBUILD) -M help "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(0)
+
+.PHONY: help Makefile
+
+# catch-all target: route all unknown targets to Sphinx. $(0) is shortcut for
+# $(SPHINXOPTS).
+%: Makefile
+	@$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(0)