Added Docker Support

Dockerfile

@@ -0,0 +1,22 @@
+# pull official base image
+FROM node:14-alpine
+
+# set working directory
+WORKDIR /app
+
+# add `/app/node_modules/.bin` to $PATH
+ENV PATH /app/node_modules/.bin:$PATH
+
+# install app dependencies
+COPY package.json ./
+RUN npm install --silent
+RUN npm install react-scripts@4.0.0 -g --silent
+
+# add app
+COPY . ./
+
+# Expose port
+EXPOSE 3000
+
+# start app
+CMD ["npm", "start"]

docker-compose.yml

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+version: '3.7'
+
+services:
+
+  sample:
+    container_name: react-datta
+    build:
+      context: .
+      dockerfile: Dockerfile
+    volumes:
+      - '.:/app'
+      - '/app/node_modules'
+    ports:
+      - 3000:3000
+    environment:
+      - CHOKIDAR_USEPOLLING=true
+