add README

README

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+
+the dumbest image gallery possible
+
+see https://gitlab.com/cinnaboot/ansible_roles/-/blob/master/roles/gallery/tasks/main.yml for an ansible role
+
+or create a python virtual environment:
+$ virtualenv venv
+$ source venv/bin/activate
+(venv) $ pip install -r requirements.txt
+
+then start a local flask development server:
+(venv) $ export FLASK_APP=gallery
+(venv) $ export FLASK_ENV=development
+(venv) $ flask run
+
+Make album folders under 'instance/images', and copy some images.
+