Add Makefile to enable "quickstart" workflow

Nothing too complex, but it's nice to be able to show up in a new
project, `make test` and have it "just work".
Documented in the readme.

Gets rid of test.sh . Since `make test` is a superior replacement,
there's no reason to keep it.

Makefile

@@ -0,0 +1,27 @@
+# control the py version used to install tox
+# use like
+#   NOSE2_PYTHON_VERSION=python3.6 make docs
+NOSE2_PYTHON_VERSION?=python
+VIRTUALENV=.venv-$(NOSE2_PYTHON_VERSION)
+
+.PHONY: help docs test clean
+
+help:
+	@echo 'Easy setup for local nose2 development'
+	@echo 'make help    Show this help'
+	@echo 'make docs    Build docs'
+	@echo 'make test    Test nose2'
+	@echo 'make clean   Cleanup'
+
+$(VIRTUALENV)/bin/tox:
+	virtualenv --python "$(NOSE2_PYTHON_VERSION)" $(VIRTUALENV)
+	$(VIRTUALENV)/bin/pip install tox==2.9.1
+
+test: $(VIRTUALENV)/bin/tox
+	$(VIRTUALENV)/bin/tox
+docs: $(VIRTUALENV)/bin/tox
+	$(VIRTUALENV)/bin/tox -e docs
+
+clean:
+	$(MAKE) -C docs/ clean
+	rm -rf .venv-*

README.rst

@@ -47,4 +47,15 @@ plugins branch, and overrides various unittest2 objects.
 You are witnesses at the new birth of nose, mark 2. Hope you enjoy our
 new direction!
 
+Workflow
+--------
+
+If you want to make contributions, you can use the ``Makefile`` to get started
+quickly and easily::
+
+    # no prior setup necessary!
+    make test
+
+Use ``make help`` to see other options.
+
 .. _differences: https://nose2.readthedocs.io/en/latest/differences.html