add drone pipeline

.drone.yml

@@ -0,0 +1,13 @@
+---
+kind: pipeline
+type: kubernetes
+name: python
+
+steps:
+- name: test
+  image: python:latest
+  commands:
+  - pip install --upgrade pip black flake8 mypy pylint
+  - flake8 --ignore=E501,W503,E265
+  - mypy --ignore-missing-imports
+  - pylint