Merge pull request 'add pre-commit hook for yapf auto formatting (#20)' (#21) from LukasGrossberger/ki-backend:yapf-pre-commit into main

Reviewed-on: #21

.pre-commit-config.yaml

@@ -6,6 +6,12 @@
       language: system
       files: ^.*\.py$
       exclude: ^(migrations).*$
+    - id: yapf
+      name: yapf
+      entry: yapf -i
+      language: system
+      files: ^.*\.py$
+      exclude: ^(migrations).*$
     - id: unittest
       name: unittest
       entry: python -m unittest discover ki