Added Makefile & first requirements (#2)

Makefile

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+# =====CONFIG=====
+PYTHON := python3.9
+# This can't contain spaces (I think)
+VENV   := venv
+
+
+# By default, just create the venv when needed
+all: venv
+
+
+# Create the venv
+$(VENV)/bin/activate: requirements.txt requirements-dev.txt
+	@ '$(PYTHON)' -m venv '$(VENV)'
+	@ '$(VENV)'/bin/pip install -r requirements.txt -r requirements-dev.txt
+
+# Convenient alias for the venv
+venv: $(VENV)/bin/activate
+.PHONY: venv
+
+
+# Remove the venv
+clean:
+	@ rm -rf '$(VENV)'
+
+
+# Run the Flask server
+# TODO
+run: venv
+
+
+# Format the codebase using black
+format: venv
+	@ '$(VENV)/bin/python' -m black src
+
+# Lint the codebase using flake8
+lint: venv
+	@ '$(VENV)/bin/python' -m flake8 src
+
+# Run rests using pytest
+# TODO
+test: venv

requirements-dev.txt

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+# Formatter
+black~=20.8b1
+
+# Linter
+flake8~=3.9.0
+
+# Testing suite
+pytest~=6.2.2
+
+# Language server
+jedi~=0.18.0

requirements.txt

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+# Web framework
+Flask~=1.1.2