Add documentation for the SpaceBeforeCast sniff

Author: rodrigoprimo

src/Standards/Generic/Docs/Formatting/SpaceBeforeCastStandard.xml

@@ -0,0 +1,31 @@
+<documentation title="Space Before Casts">
+    <standard>
+    <![CDATA[
+    Ensures there is exactly one space before a cast operator.
+    ]]>
+    </standard>
+    <code_comparison>
+        <code title="Valid: Single space before a cast operator.">
+        <![CDATA[
+$integer =<em> </em>(int) $string;
+        ]]>
+        </code>
+        <code title="Invalid: No space before a cast operator.">
+        <![CDATA[
+$integer =<em></em>(int) $string;
+        ]]>
+        </code>
+    </code_comparison>
+    <code_comparison>
+        <code title="Valid: Single space before a cast operator.">
+        <![CDATA[
+$c = $a +<em> </em>(int) $b;
+        ]]>
+        </code>
+        <code title="Invalid: Multiple spaces before a cast operator.">
+        <![CDATA[
+$c = $a +<em>   </em>(int) $b;
+        ]]>
+        </code>
+    </code_comparison>
+</documentation>