Create spacing.md

Author: rasamassen

docs/usage/styles/spacing.md

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+# Spacing Styles
+
+``` php
+<?php
+
+$phpWord->addParagraphStyle('spacing', ['space' => ['before' => 120, 'after' => 240]]);
+$section->addText('Hello, World!', null, 'spacing');
+
+```
+
+See [`Sample_08_ParagraphPagination`](/samples/Sample_08_ParagraphPagination.php) for more code samples.
+
+## Options
+- `after`. Space after paragraph in *twip*.
+- `before`. Space before paragraph in *twip*.
+- `line`. Space between lines within a paragraph in *twip*. If lineRule is auto, 240 (height of 1 line) will be added, so if you want a double line height, set this to 240.
+- `lineRule`. Line Spacing Rule. *auto*, *exact*, *atLeast*
+   * See [`SimpleType > LineSpacingRule`](../simpletypes/linespacingrule.md) class constants for possible values.
+
+## Used In
+- [`Style > Paragraph`](../styles/paragraph.md).