[WIP] Spacing doc draft

docs/spacing.md

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+# Spacing
+
+Careful spacing is key for the user to understand connections and hierarchies between elements, and for an interface to feel pleasant.
+
+## Scale
+
+Primer follows a base-8 scale, as it allows for significant flexibility when defining a variety of spacing values within an interface.
+
+`[list of spacing utilities]`
+
+For very small components where 8 pixel spacing is too large, you can use 4 pixels. 
+
+## Responsive breakpoints
+
+You can define different spacing values for different breakpoints, so the interface can better adapt to the available space.
+
+`[Example: component with larger margin around it in large screen, vs smaller margin in small screen]`
+
+In code, margins can be defined per breakpoint, where different breakpoints have a different margin applied.
+
+`[Example: mb-sm-2 mb-md-3 mb-lg-4]`
+
+## Applying spacing
+
+The general rule when using Primer is to apply spacing in increments of 8 pixels, as provided by the spacing utilities. 
+
+In some cases, for very small components and in denser areas of the UI, you can use 4 pixels.
+
+`[Example: text and icon button]`
+
+Primer components have inner spacing built-in, so in most cases you’ll only need to consider vertical spacing between components.
+
+Do/Don’t: Using custom values?
+
+## Relationships
+
+Elements that are close together are perceived as being related or part of the same group, while elements that are far apart from each other feel unrelated.
+
+`[Examples: cancel, save buttons; repo top nav buttons]`
+
+Alignment
+- Do / Don’t
+
+## Hierarchy
+
+Do: Add more white space around components that are more important.
+
+`[Examples: titles]`
+
+Note: Editorial content can have more generous spacing.
+
+`[Examples: first use cards, new features cards]`
+
+## Consistency
+
+Do: Apply the same spacing values to similar components.
+
+`[Example: all items in the sidebar have the same vertical distance]`
+
+## Density
+
+`[Examples: ]`
+
+## Optical adjustments
+
+Icons
+
+Inline spacing
+
+## Common spacing values
+
+Small components usually have 8px between them. In some cases, for very small buttons, you can use 4px.
+
+`[Example: buttons side by side, labels, icon+text]`
+
+The most common value when stacking components vertically is 16px.
+
+`[Example: issue header above first comment, sidebar, stacked boxes]`
+
+## Learn more about spacing
+If you’d like to read more about spacing in UI design, we recommend:
+
+- 
+
+
+## Related
+
+- [Primer CSS - Support - Spacing](https://primer.style/css/support/spacing)
+- [Primer CSS - Utilities - Padding](https://primer.style/css/utilities/padding)
+- [Primer CSS - Utilities - Margin](https://primer.style/css/utilities/margin)
+- [Primer CSS - Utilities - Borders](https://primer.style/css/utilities/borders)
+- [Primer Primitives - Spacing](https://github.com/primer/primitives/blob/master/primitives/spacing.ts)