Lisk Commander generates README with depreciated content

[TalhaMaliktz]

Expected behavior

The README should follow the SDK's v5 to v6 migration rules.

Actual behavior

When you init a new blockchain client, the default README generated by the commander for the blockchain client has old terminologies in it.
The readme has depreciated terms such as moduleID, assets, and assetID which are not in use anymore.

Following is a sample README generated by the lisk init command:

# Getting Started with Lisk Blockchain Client

This project was bootstrapped with [Lisk SDK](https://github.com/LiskHQ/lisk-sdk)

### Start a node

./bin/run start

### Add a new module

lisk generate:module ModuleName ModuleID
// Example
lisk generate:module token 1

### Add a new asset

lisk generate:asset ModuleName AssetName AssetID
// Example
lisk generate:asset token transfer 1

### Add a new plugin

lisk generate:plugin PluginName
// Example
lisk generate:plugin httpAPI

## Learn More

You can learn more in the [documentation](https://lisk.com/documentation/lisk-sdk/).

Steps to reproduce

lisk init

Which version(s) does this affect? (Environment, OS, etc...)

lisk-commander@6.0.0-beta.7