chore(cube-doctor): add cube-doctor.yml

.cube-doctor.yml

+---
+rules:
+  add-new-rules:
+    project-kind: cubicweb-cube
+  fix-README:
+  add-pytest-deprecated-warnings:
+  add-pypi-publish:
+  add-deb-publish:
+  add-yamllint:
+  update-licence-dates:

MANIFEST.in

@@ -5,3 +5,4 @@ recursive-include cubicweb_varnish/i18n *.po
 recursive-include test/data bootstrap_cubes *.py
 include tox.ini
 exclude .yamllint
+exclude .cube-doctor.yml