Add pre-commit hooks configuration

.pre-commit-config.yaml

@@ -0,0 +1,22 @@
+-   repo: git://github.com/pre-commit/pre-commit-hooks
+    sha: 7539d8bd1a00a3c1bfd34cdb606d3a6372e83469
+    hooks:
+    -   id: check-added-large-files
+    -   id: check-case-conflict
+    -   id: check-merge-conflict
+    -   id: check-symlinks
+    -   id: check-yaml
+    -   id: double-quote-string-fixer
+    -   id: end-of-file-fixer
+    -   id: name-tests-test
+    -   id: trailing-whitespace
+-   repo: git://github.com/pre-commit/mirrors-yapf
+    sha: v0.11.1
+    hooks:
+    -   id: yapf
+-   repo: git://github.com/FalconSocial/pre-commit-python-sorter
+    sha: 1.0.4
+    hooks:
+    -   id: python-import-sorter
+        args:
+        - --silent-overwrite