Add pre-commit and yamllint configuration

.pre-commit-config.yaml

@@ -0,0 +1,10 @@
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v2.3.0
+    hooks:
+      - id: end-of-file-fixer
+      - id: trailing-whitespace
+  - repo: https://github.com/adrienverge/yamllint.git
+    rev: v1.17.0
+    hooks:
+      - id: yamllint

.yamllint

@@ -0,0 +1,5 @@
+---
+extends: default
+
+rules:
+  document-start: disable