add pre-commit and its config with black and flake8 + plugins hooks

Author: Masynchin

.pre-commit-config.yaml

@@ -0,0 +1,15 @@
+repos:
+- repo: https://github.com/psf/black
+  rev: 21.7b0
+  hooks:
+  - id: black
+    args: ['-l 79']
+- repo: https://gitlab.com/pycqa/flake8
+  rev: 3.9.2
+  hooks:
+  - id: flake8
+    additional_dependencies:
+    - flake8-bugbear
+    - flake8-comprehensions
+    - flake8-docstrings
+    - pep8-naming

requirements-dev.txt

@@ -7,3 +7,5 @@ flake8-bugbear
 flake8-comprehensions
 flake8-docstrings
 pep8-naming
+
+pre-commit