Add CI/build infrastructure

.gitignore

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+.DS_Store
+.idea
+*.log
+tmp/
+
+*.py[cod]
+*.egg
+build
+htmlcov
+src/gbasm.egg-info
+**/.mypy_cache
+**/.pytest_cache
+**/.tox
+**/__pycache__

.gitlab-ci.yml

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+image: python:latest
+
+# Change pip's cache directory to be inside the project directory since we can
+# only cache local items.
+variables:
+  PIP_CACHE_DIR: "$CI_PROJECT_DIR/.cache/pip"
+
+# Pip's cache doesn't store the python packages
+# https://pip.pypa.io/en/stable/reference/pip_install/#caching
+#
+# If you want to also cache the installed packages, you have to install
+# them in a virtualenv and cache it as well.
+cache:
+  paths:
+    - .cache/pip
+    - venv/
+
+before_script:
+  - python -V
+  - pip install virtualenv
+  - virtualenv venv
+  - source venv/bin/activate
+
+lint:
+  script:
+    - pip3 install black
+    - black --check src/
+
+test:
+  script:
+    - pip3 install tox

setup.cfg

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+[metadata]
+name = gbasm
+version = 0.0.1
+author = Max Regan
+author_email = mgregan2@gmail.com
+description = An assembler for Gameboy assembly language
+classifiers =
+    Programming Language :: Python :: 3
+    License :: OSI Approved :: MIT License
+    Operating System :: OS Independent
+
+[options]
+package_dir =
+    = src
+packages = find:
+python_requires = >=3.7
+tests_require = pytest
+test_suite = test_assemble
+requires = pyyaml, foobarbdfasf
+
+[options.packages.find]
+where =
+      src
+      test
+
+[options.entry_points]
+console_scripts =
+    gbasm = gbasm.gbasm:main
+
+[tox:tox]
+envlist = py39
+
+[testenv]
+deps = pytest
+     pyyaml
+commands = pytest

setup.py

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+import os
+from setuptools import setup
+
+setup()