Ajout d'un Makefile compatible venv

Signed-off-by: Vincent-Xavier JUMEL <vincent-xavier.jumel@ac-paris.fr>

Makefile

+# system python interpreter. used only to create virtual environment
+PY = python3
+VENV = ".venv"
+BIN=$(VENV)/bin
+
+# make it work on windows too
+ifeq ($(OS), Windows_NT)
+    BIN=$(VENV)/Scripts
+    PY=python
+endif
+
+
+all: lint test
+
+$(VENV): requirements.txt requirements-dev.txt setup.py
+    $(PY) -m venv $(VENV)
+    $(BIN)/pip install --upgrade -r requirements.txt
+    $(BIN)/pip install --upgrade -r requirements-dev.txt
+    $(BIN)/pip install -e .
+    touch $(VENV)
+
+.PHONY: build
+build: $(VENV)
+    $(BIN)/jb build .
+
+.PHONY: lint
+lint: $(VENV)
+    $(BIN)/flake8
+
+