feat(package): Add placeholders

Author: bmuenzenmeyer

source/_annotations/README.md

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+This is the default location to place annotations.
+
+Pattern Lab uses annotations defined here to markup the UI. Read more about [annotations](http://patternlab.io/docs/pattern-adding-annotations.html).
+
+If you wish to rename this directory, make sure you update the `paths.source.annotations` property within `patternlab-config.json`.

source/_data/README.md

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+This is the default location to place global data files.
+
+Pattern Lab uses data defined here as the global fallback if a template does not provide its own data. Read more about [data](http://patternlab.io/docs/data-overview.html).
+
+If you wish to rename this directory, make sure you update the `paths.source.data` property within `patternlab-config.json`.

source/_meta/README.md

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+This is the default location to place meta files, otherwise known a pattern's header and footer.
+
+Pattern Lab builds each pattern while prepending and appending the header and footer. Read more about [pattern headers and footers](http://patternlab.io/docs/pattern-header-footer.html).
+
+If you wish to rename this directory, make sure you update the `paths.source.meta` property within `patternlab-config.json`.

source/_patterns/README.md

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+This is the default location to place pattern files.
+
+Pattern Lab builds patterns and the ui from the structure defined within. Read more about [pattern organization](http://patternlab.io/docs/pattern-organization.html).
+
+If you wish to rename this directory, make sure you update the `paths.source.patterns` property within `patternlab-config.json`.

source/css/README.md

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+This is the default location to place global css files.
+
+The entire contents of this directory will be recursively copied to your configured `public/` directory.
+
+If you wish to rename this directory, make sure you update the `paths.source.css` property within `patternlab-config.json`.

source/favicon.ico

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+This is the default location to place global font files.
+
+The entire contents of this directory will be recursively copied to your configured `public/` directory.
+
+If you wish to rename this directory, make sure you update the `paths.source.fonts` property within `patternlab-config.json`.