Added frontend

Signed-off-by: GitHub <noreply@github.com>

react-aspnet-mongodb/frontend/README.md

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+#### Snippet of frontend(ReactJS)`DockerFile`
+
+You will find this `DockerFile` inside **frontend** directory. 
+
+```bash
+# Create image based on the official Node image from dockerhub
+FROM node:10
+#Argument that is passed from docer-compose.yaml file
+ARG FRONT_END_PORT
+# Create app directory
+WORKDIR /usr/src/app
+#Echo the argument to check passed argument loaded here correctly
+RUN echo "Argument port is : $FRONT_END_PORT"
+# Copy dependency definitions
+COPY package.json /usr/src/app
+# Install dependecies
+RUN npm install
+# Get all the code needed to run the app
+COPY . /usr/src/app
+# Expose the port the app runs in
+EXPOSE ${FRONT_END_PORT}
+# Serve the app
+CMD ["npm", "start"]
+```
+##### Explanation of frontend(ReactJS) `DockerFile`
+
+Frontend `DockerFile` is almost the same as Backend `DockerFile`.