updated the markdown

Author: b.chirani

README.md

@@ -13,7 +13,9 @@ Snappy is chat application build with the power of MERN Stack. You can find the
 - [Mongodb](https://www.mongodb.com/docs/manual/administration/install-community/)
 
 Both should be installed and make sure mongodb is running.
+### Installation
 
+#### First Method
 ```shell
 git clone https://github.com/koolkishan/chat-app-react-nodejs
 cd chat-app-react-nodejs
@@ -50,5 +52,17 @@ Open another terminal in folder, Also make sure mongodb is running in background
 cd server
 yarn start
 ```
-
 Done! Now open localhost:3000 in your browser.
+
+#### Second Method
+- This method requires docker and docker-compose to be installed in your system.
+- Make sure you are in the root of your project and run the following command.
+
+```shell
+docker compose build --no-cache
+```
+after the build is complete run the containers using the following command
+```shell
+docker compose up
+```
+now open localhost:3000 in your browser.