feat: containerize backend and frontend

[DevDoshi19]

Adding docker files :

• .dockerignore
• Dockerfile
• docker-compose.yml

Each file for there own purpose :

• Dockerfile which have full docker workflow for creating Image and command
• .dockerignore file will work same as .gitignore which will ignore all the non use or private files
• docker-compose.yml file : This file help us to run both the docker file (frontend and backend ) in single file . so we don't need to manually run and build both the images.