Introduce README for partials folder.

partials/README.md

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+fresh-themes/assets/partials
+============================
+This folder contains global partials available to all FRESH themes. A global
+partial is a reusable fragment of HTML, XML, or other markup that can be
+injected into your theme.
+
+## Use
+
+To load a global partial, use the following syntax in your theme:
+
+```hbs
+{{> section/[section-name] }}
+```
+
+For example:
+
+```hbs
+{{> section/employment }}
+{{> section/projects }}
+{{> section/employment }}
+```
+
+Currently two types of global partials are available:
+
+- Section partials (DOC and HTML formats) that represent a specific resume
+section.
+- Icon partials for DOC formats that make it a bit easier to embed images in
+the MS Word resume format.
+
+Many more will be supported in the future.
+
+## Overriding
+
+Themes can also declare theme-specific partials located in the theme's
+`/partials` folder (if any).