Add linting config files

Author: hugorodgerbrown

.editorconfig

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+# editorconfig.org
+root = true
+
+[*]
+indent_style = space
+indent_size = 4
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true

.flake8

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+[flake8]
+max-line-length = 88
+max-complexity = 8
+exclude =
+  .git,
+  .venv,
+  .tox,
+  tests
+# http://flake8.pycqa.org/en/2.5.5/warnings.html#warning-error-codes
+ignore =
+  # pydocstyle - docstring conventions (PEP257)
+  D1    # [pydocstyle] missing docstring
+  D203  # [pydocstyle] 1 blank line required before class docstring
+  D212  # [pydocstyle] Multi-line docstring summary should start at the first line
+  D406  # [pydocstyle] Section name should end with a newline
+  D407  # [pydocstyle] Missing dashed underline after section
+  D412  # [pydocstyle] No blank lines allowed between a section header and its content
+  # pycodestyle - style checker (PEP8)
+  W503  # [pycodestyle] line break before binary operator
+  W504  # [pycodestyle] line break after binary operator
+  # bandit - security warnings
+  S308  # [bandit] Use of mark_safe
+  S311  # [bandit] Use of random
+  S703  # [bandit] Use of django_mark_safe

.isort.cfg

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+[settings]
+default_section=THIRDPARTY
+indent='    '
+sections=FUTURE,STDLIB,THIRDPARTY,FIRSTPARTY,LOCALFOLDER
+multi_line_output=3
+line_length=88
+include_trailing_comma=True
+use_parentheses=True

.prettierrc

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+{
+    "printWidth": 100,
+    "tabWidth": 4,
+    "useTabs": false,
+    "semi": true,
+    "singleQuote": false,
+    "trailingComma": "none",
+    "bracketSpacing": true,
+    "jsxBracketSameLine": false,
+    "proseWrap": "always",
+    "endOfLine": "auto"
+}

mypy.ini

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+[mypy]
+strict_optional=True
+ignore_missing_imports=True
+follow_imports=silent
+warn_redundant_casts=True
+warn_unused_ignores = true
+warn_unreachable = true
+disallow_untyped_defs = true
+disallow_incomplete_defs = true
+
+# Disable mypy for migrations
+[mypy-*.migrations.*]
+ignore_errors=True
+
+# Disable mypy for settings
+[mypy-settings.*]
+ignore_errors=True
+
+# Disable mypy for tests
+[mypy-package_monitor.tests.*]
+ignore_errors=True

pytest.ini

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+[pytest]
+DJANGO_SETTINGS_MODULE = settings