Update README.md

[Saurabhyadav0]

added github command and there used

Brief description of the changes

Type of changes

• New device
• Update existing device
• Removing a device
• General cleanup
• Other

Checklist:

• There are no passwords or secrets references in any examples.
  The only exceptions are !secret wifi_ssid and !secret wifi_password.
• The wifi or ethernet block has no static / manual ip address specified.
• The first configuration provided should be hardware definitions only.
  A more involved example can be provided in a separate configuration block.

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[Saurabhyadav0]

@rweir @evgeni @aceindy @glmnet readme file upadted with github command