Add docker example

Dockerfile

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+FROM python:3.8-alpine
+
+ENV PYTHONUNBUFFERED 1
+
+WORKDIR /src
+
+COPY requirements.txt /src/requirements.txt
+RUN pip install -r /src/requirements.txt
+
+COPY basic_greeting_bot.py /src/bot.py
+
+CMD ["python", "/src/bot.py"]

docker-compose.yml

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+version: "3.8"
+
+services:
+  discord-bot:
+    container_name: discord-bot
+    build: .
+    restart: on-failure
+    env_file:
+      - .sample_env
+