Created Whitespace (markdown)

Whitespace.md

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+# Do not add a whitespace before a semicolon
+
+A semicolon indicates the end of a line of code. Spaces before the semicolon is unnecessary and must be removed.
+
+<details><summary>Example</summary><div><br>
+
+**Bad**
+
+```PHP
+echo 'Hello World!' ;
+```
+
+**Good**
+
+```PHP
+echo 'Hello World!';
+```
+
+</div></details><br>
+
+_Reference_: [`Squiz.WhiteSpace.SemicolonSpacing`](https://github.com/squizlabs/PHP_CodeSniffer/blob/master/src/Standards/Squiz/Sniffs/WhiteSpace/SemicolonSpacingSniff.php)
+
+# Do not add whitespace at start or end of a file or end of a line
+
+Whitespace at the end of lines or at the start or end of a file is invisible to the reader and absolutely unnecessary. Thus it must be removed.
+
+_Reference_: [`Squiz.WhiteSpace.SuperfluousWhitespace`](https://github.com/squizlabs/PHP_CodeSniffer/blob/master/src/Standards/Squiz/Sniffs/WhiteSpace/SuperfluousWhitespaceSniff.php)