Add DO deploy

.do/deploy.template.yaml

+name: MichiganFlyer-Election
+services:
+- name: web
+  git:
+    repo_clone_url: https://github.com/michiganflyers/elections.git
+    branch: main
+  dockerfile_path: Dockerfile

README.md

+# Election Runner
+## Michigan Flyers Digital and Paper Ballot Hybrid Tally System
+
+[![Deploy to DO](https://www.deploytodo.com/do-btn-blue-ghost.svg)](https://cloud.digitalocean.com/apps/new?repo=https://github.com/michiganflyers/elections/tree/main)