Update Readme with nvm and using correct version of angular/cli

[ankita132]

Description

As a user,to run the app locally we need to install the correct versions of Node and angular in the system which is not always the case,so the readme should be updated with steps of using NVM.

Acceptance Criteria

Update [Required]

• Update the readme by including the steps for using nvm and installing the correct version of angular/cli

Definition of Done

• All of the required items are completed.
• Approval by 1 mentor.

Estimation

1 to 2 hours

[Raxerz]

@ankita132 Doesn't npm install automatically install the required version of angular/cli and other packages?

[ankita132]

@Raxerz what happened in my case is I did not have angular-cli installed on my system globally.So I had to install it explicitly globally as well for the command ng build --watch to work.