Added dev environment for docker

backend/Dockerfile

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+# For more information, please refer to https://aka.ms/vscode-docker-python
+FROM python:3.9
+
+EXPOSE 5000
+
+# Keeps Python from generating .pyc files in the container
+ENV PYTHONDONTWRITEBYTECODE 1
+
+# Turns off buffering for easier container logging
+ENV PYTHONUNBUFFERED 1
+
+# Install pip requirements
+ADD requirements.txt .
+RUN python -m pip install -r requirements.txt
+                                                                                   
+WORKDIR /app
+ADD . /app
+
+CMD ["flask", "run"]