add backend and docker files

backend/django/Dockerfile

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+# base image  
+FROM python:3.8   
+# setup environment variable  
+ENV DockerHOME=/home/app/webapp  
+
+# set work directory  
+RUN mkdir -p $DockerHOME  
+
+# where your code lives  
+WORKDIR $DockerHOME  
+
+# set environment variables  
+ENV PYTHONDONTWRITEBYTECODE 1
+ENV PYTHONUNBUFFERED 1  
+
+# install dependencies  
+RUN pip install --upgrade pip  
+
+# copy whole project to your docker home directory. 
+# COPY . $DockerHOME  
+COPY ./requirements.txt $DockerHOME
+# Don't need to copy entire project directory, just use a docker volume with a local path
+# run this command to install all dependencies  
+RUN pip install -r requirements.txt  
+# port where the Django app runs  
+EXPOSE 8000  
+# start server  
+CMD python seatstock_django/manage.py runserver