Add pre-commit (#140)

* Add pre-commit config files

* Add linting test on github action

.pre-commit-config.yaml

@@ -0,0 +1,15 @@
+repos:
+  - repo: https://gitlab.com/pycqa/flake8
+    rev: 3.7.9
+    hooks:
+      - id: flake8
+  - repo: https://github.com/pycqa/isort
+    rev: 5.5.4
+    hooks:
+      - id: isort
+        args: ["--profile", "black"]
+  - repo: https://github.com/psf/black
+    rev: 20.8b1
+    hooks:
+      - id: black
+        language_version: python3