Add docker setup

Dockerfile

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+FROM python:3.9-slim
+
+WORKDIR /app
+
+ENTRYPOINT ["python3", "-m", "cloudflare-ddns"]
+CMD []
+
+# Install requirements in a separate step to not rebuild everything when the requirements are updated.
+COPY requirements.txt ./
+RUN pip install -r requirements.txt
+
+COPY . .

docker-compose.yaml

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+## Development docker-compose
+version: "3.7"
+services:
+  cloudflare-ddns:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    container_name: cloudflare-ddns

requirements.txt

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+requests~=2.25.1
+click8~=8.0.1