added dockerfile for react frontend

# ./react-frontend/Dockerfile

FROM node:16

WORKDIR /app

# Copy package.json and package-lock.json

COPY ./my-react-app/package*.json ./

# Install dependencies

RUN npm install

# Copy the rest of the application code

COPY . .

# Create .cache directory and set permissions

RUN mkdir -p /app/node_modules/.cache && chmod -R 777 /app/node_modules/.cache

# Set permissions for the entire application directory

RUN chmod -R 777 /app

# Start the React development server

CMD ["npm", "start"]