Add pre-commit config

.pre-commit-config.yaml

@@ -0,0 +1,14 @@
+repos:
+- repo: https://github.com/pre-commit/pre-commit-hooks
+  rev: v2.3.0
+  hooks:
+  - id: trailing-whitespace
+  - id: flake8
+  - id: check-merge-conflict
+  - id: check-yaml
+  - id: check-executables-have-shebangs
+  - id: mixed-line-ending
+-   repo: https://github.com/psf/black
+    rev: stable
+    hooks:
+    -   id: black