Add grid docs page

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+---
+title: The Grid
+description: If you're familiar with the Foundation for Sites grid, you'll be right at home working with Foundation for Emails.
+---
+
+The grid has two core elements: the *row* and *column*. Rows define horizontal sections of content, and columns carve up the row into side-by-side sections.
+
+## Container
+
+All emails should have a container element. This gives the email a maximum width for email clients on larger screens. It also orients the email in the center.
+
+A container is a full table, so it needs the tags `<table>` `<tbody>`, `<tr>`, and finally `<td>`. The class `.container` goes on the `<table>`.
+
+```inky
+<container></container>
+```
+
+---
+
+## Rows
+
+A row is a `<table>` with a `<tbody>` and `<tr>`. Inside of this `<tr>`, you'll place each individual column. The `<table>` also has the class `.row`.
+
+In Inky HTML, use the `<row>` tag to create a row.
+
+```inky
+<row></row>
+```
+
+---
+
+## Columns
+
+The structure of a column is a bit more involved. At the top level, a column is a `<th>` with the class `.columns`.
+
+Inside of the `<th>` is another full table. The content of your column goes inside of a `<th>`. Right below that table header should be *another* `<th>` with a class of `.expander`. This empty element helps the column expand to be full-width on small screens.
+
+Here's our full column syntax so far:
+
+```html
+<th class="columns first last">
+  <table>
+    <tr>
+      <th>This is a column.</th>
+      <th class="expander"></th>
+    </tr>
+  </table>
+</th>
+```
+
+In Inky HTML, use the `<columns>` class to create a column.
+
+```inky
+<columns>This is a column.</columns>
+```
+
+### Sizing
+
+A column has a *size* between 1 and 12&mdash;this is how many columns wide the element is. Foundation uses a 12-column grid, so 6 columns is half the width of the whole row.
+
+Set column sizes with the classes `.large-n` and `.small-n`, where `n` is how wide the column is. The `.small-` size is applied on mobile email clients, while the `.large-` size is applied on desktop email clients.
+
+In Inky HTML, set the attribute `small` or `large` on the `<columns>` tag with the size you want. If you don't fill in `small`, it will use 12 by default. If you fill in `small` but not `large`, `large` will use the same value as `small`.
+
+```inky
+<columns small="12" large="6"></columns>
+```
+
+### First and Last Classes
+
+The first column in a row must have the class `.first`, and the last column must have the class `.last`.
+
+In Inky HTML, these classes are added for you.
+
+```inky
+<columns large="4">One</columns>
+<columns large="4">Two</columns>
+<columns large="4">Three</columns>
+```
+
+---
+
+## Collapsing
+
+Collapsing a row removes the gutters from every column, which is the spacing between them. Add the class `.collapse` to a row to enable this.
+
+```inky
+<row class="collapse">
+  <columns large="6">These columns touch.</columns>
+  <columns large="6">These columns touch.</columns>
+</row>
+```
+
+---
+
+## Offsets
+
+Offsets add spacing to the left of a column. Use this if all the columns in a row don't add up to 12, and you want to mess with the spacing between them.
+
+Use the class `.large-offset-n` to create an offset, where `n` is the amount of columns to offset by. So, for example, `.large-offset-3` would offset the column by 25% of the width of the row.
+
+```inky
+<row>
+  <columns large="3" class="large-offset-3">One</columns>
+  <columns large="3">Two</columns>
+</row>
+```