Added pre-commit hooks

.flake8

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+[flake8]
+exclude = venv
+ignore = E501, W503, E226, E203
+max-line-length = 85
+
+# E501: Line too long
+# W503: Line break occurred before binary operator
+# E226: Missing white space around arithmetic operator

.pre-commit-config.yaml

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+# See https://pre-commit.com for more information
+# See https://pre-commit.com/hooks.html for more hooks
+repos:
+-   repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v3.4.0
+    hooks:
+    -   id: trailing-whitespace
+    -   id: check-yaml
+    -   id: check-ast
+    -   id: check-json
+    -   id: check-merge-conflict
+    -   id: detect-private-key
+-   repo: https://github.com/psf/black
+    rev: 21.6b0
+    hooks:
+    -   id: black
+        args: []
+        files: .
+-   repo: https://gitlab.com/PyCQA/flake8
+    rev: 3.9.2
+    hooks:
+    -   id: flake8
+-   repo: https://github.com/PyCQA/isort
+    rev: 5.9.1
+    hooks:
+    -   id: isort
+        args: []
+        files: .

pyproject.toml

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+# Black formatting
+[tool.black]
+line-length = 85
+include = '\.pyi?$'
+exclude = '''
+/(
+      \.eggs         # exclude a few common directories in the
+    | \.git          # root of the project
+    | \.hg
+    | \.mypy_cache
+    | \.tox
+    | \.venv
+    | _build
+    | buck-out
+    | build
+    | dist
+    | wandb
+    | model
+    | dataset
+    | notebook
+  )/
+'''
+
+# iSort
+[tool.isort]
+profile = "black"
+line_length = 85
+multi_line_output = 3
+include_trailing_comma = true
+skip_gitignore = true
+virtual_env = "venv"