Add pre-commit hooks

.pre-commit-config.yaml

@@ -0,0 +1,16 @@
+-   repo: git://github.com/pre-commit/pre-commit-hooks
+    sha: 97b88d9610bcc03982ddac33caba98bb2b751f5f
+    hooks:
+    -   id: trailing-whitespace
+    -   id: flake8
+        args:
+        - --exclude=*/*migrations/*, testproject/testproject/settings/*
+    -   id: check-added-large-files
+    -   id: debug-statements
+    -   id: end-of-file-fixer
+-   repo: git://github.com/FalconSocial/pre-commit-python-sorter
+    sha: d044ff27300a6dc8b1a56cd22552e3a810dc6f49
+    hooks:
+    -   id: python-import-sorter
+        args:
+        - --silent-overwrite

README.rst

@@ -122,6 +122,11 @@ Development / demo project
 In your Git fork, run ``pip install -r requirements.txt`` to install the
 requirements.
 
+Install pre-commit hooks to verify your commits::
+
+    pip install pre-commit
+    pre-commit install
+
 The folder **test-project/** contains a pre-configured django project and
 an SQlite database. Login for django admin is *admin:admin*::