how to use bootstrap framework

Question

I downloaded bootstrap framework using this link available on codeplex.

I have created empty sharepoint project in visual studio 2013. Then manually added bootstrap related files in Layout folder. See my project files in visual studio below

Now i went to my page and selected site settings. Then i selected Look and feel >Master page. But i cannot see bootstrap.master. How can i see that in site settings. I am using sharepoint 2013

Update1

My element.xml is as below

<Elements xmlns="http://schemas.microsoft.com/sharepoint/">
<Module Name="MasterPage" List="116" Url="_catalogs/masterpage">
 <File Path="MasterPage\acme.master" Url="acme.master" />
 <File Path="MasterPage\bootstrap3.master" Url="bootstrap3.master" />
</Module>

My module1's element.xml is as below

<?xml version="1.0" encoding="utf-8"?>
<Elements xmlns="http://schemas.microsoft.com/sharepoint/">
 <Module Name="Module1">
  <File Path="Module1\Mycustom.css" Url="Mycustom.css" />
</Module>
</Elements>

Answer 1

Go to Master Page Gallery, then Publish and Approve the master page.

Try changing XML file as follows

<Elements xmlns="http://schemas.microsoft.com/sharepoint/">
    <Module Name="MasterPage" List="116" Url="_catalogs/masterpage">
    <File Path="MasterPage\acme.master" Url="acme.master" Type="GhostableInLibrary" Level="Published" ReplaceContent="true"/>
    <File Path="MasterPage\bootstrap3.master" Url="bootstrap3.master" Type="GhostableInLibrary" Level="Published" ReplaceContent="true"/>
    </Module>
</Elements>