Add Docker support

Dockerfile

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+FROM python:3.11.2-alpine3.17
+
+LABEL Maintainer="serega404"
+
+WORKDIR /app
+
+COPY requirements.txt requirements.txt
+RUN pip3 install -r requirements.txt
+
+# Setting up crontab
+COPY crontab /tmp/crontab
+RUN cat /tmp/crontab > /etc/crontabs/root
+
+COPY main.py main.py
+
+# run crond as main process of container
+CMD ["crond", "-f", "-l", "2"]