Add pre-commit hooks for checking common problems

.pre-commit-config.yaml

@@ -0,0 +1,19 @@
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v1.2.3
+    hooks:
+      - id: autopep8-wrapper
+      - id: check-byte-order-marker
+      - id: check-case-conflict
+      - id: check-json
+      - id: check-merge-conflict
+      - id: check-yaml
+      - id: end-of-file-fixer
+      - id: flake8
+      - id: mixed-line-ending
+        args:
+          - --fix=lf
+      - id: name-tests-test
+        args:
+          - --django
+      - id: trailing-whitespace