docs: contributing guide (#1970)

* Adds basic contributing guides.
* Simplifies Python development with a Makefile.

python/Makefile

@@ -0,0 +1,32 @@
+PIP_EXTRA_INDEX_URL ?= https://pypi.fury.io/lancedb/
+
+help:		## Show this help.
+	@sed -ne '/@sed/!s/## //p' $(MAKEFILE_LIST)
+
+.PHONY: develop
+develop:	## Install the package in development mode.
+	PIP_EXTRA_INDEX_URL=$(PIP_EXTRA_INDEX_URL) maturin develop --extras tests,dev,embeddings
+
+.PHONY: format
+format:		## Format the code.
+	cargo fmt
+	ruff format python
+
+.PHONY: check
+check:		## Check formatting and lints.
+	cargo fmt --check
+	ruff format --check python
+	cargo clippy
+	ruff check python
+
+.PHONY: fix
+fix:		## Fix python lints
+	ruff check python --fix
+
+.PHONY: doctest
+doctest:	## Run documentation tests.
+	pytest --doctest-modules python/lancedb
+
+.PHONY: test
+test:		## Run tests.
+	pytest python/tests -vv --durations=10 -m "not slow"