Add DO deploy

.do/deploy.template.yaml

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

README.md

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+# 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)