Initialize improved .forceignore file

[clemfernandez]

All rules may not be working though, needs some more testing

# Standard profiles
Admin.profile
Agent de service.profile
End User.profile
Executive Sponsor.profile
Read Only.profile
Superviseur du service.profile

# standard__ apps
**/applications/standard__*

# appSwitcher folder
**/appMenus/AppSwitcher.appMenu-meta.xml

# Product2 standard fields
**/Product2/fields/Description.field-meta.xml
**/Product2/fields/DisplayUrl.field-meta.xml
**/Product2/fields/ExternalDataSourceId.fiel-meta.xmld
**/Product2/fields/ExternalId.field-meta.xml
**/Product2/fields/Family.field-meta.xml
**/Product2/fields/IsActive.field-meta.xml
**/Product2/fields/Name.field-meta.xml
**/Product2/fields/ProductCode.field-meta.xml
**/Product2/fields/QuantityUnitOfMeasure.fiel-meta.xmld
**/Product2/fields/StockKeepingUnit.field-meta.xml

# Ignored folders
**/profilePasswordPolicies/**
**/connectedApps/**
**/certs/**
**/dashboards/**