[TYPO3-english] Add page layout in bootstrap package typo3 6.2

[Gunnar Jonsson]

I want a page layout with 3 grids for left margin and 9 grids for normal. Are there any tutorial how to add a new page layout in bootstrap package? 

I have copied one of the HTML files and renamed it Default2VColumns.html, so it looks like:
<f:layout name="Default" /> <f:section name="Main"> <div class="container"> <div class="row"> <div class="col-md-3"> <f:cObject typoscriptObjectPath="lib.dynamicContent" data="1" /> </div> <div class="col-md-9" role="main"> <f:cObject typoscriptObjectPath="lib.dynamicContent" data="0" /> </div> </div> </div> </f:section>

And I also inserted the following in the root template:
page.10.file.stdWrap.cObject.bootstrap_package__default_2_V_columns = TEXT
page.10.file.stdWrap.cObject.bootstrap_package__default_2_V_columns.value = EXT:bootstrap_package/Resources/Private/Templates/Page/Default2VColumns.html
page.10.file.stdWrap.cObject.bootstrap_package__default_2_V_columns.insertData = 1

It seems like this is not enough in order to use it for page layout. Someone who knows what more is needed? I also wonder what "role="main" is used for.

Regards,
Gunnar Jonsson