Add escape/unescape string

snippets/escapeString.md

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+### escapeString
+
+Escapes a string for use in HTML.
+
+Use a chain of `String.replace()` calls combined with regular expressions to replace special characters with the proper symbols.
+
+```js
+const escapeString = str =>
+  str.replace(/&/g, '&amp;').replace(/"/g, '&quot;').replace(/'/g, '&#39;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
+```
+
+```js
+escapeString('<a href="#">Me & you</a>'); // '&lt;a href=&quot;#&quot;&gt;Me &amp; you&lt;/a&gt;'
+```

snippets/unescapeString.md

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+### unescapeString
+
+Unescapes a string from HTML.
+
+Use a chain of `String.replace()` calls combined with regular expressions to replace special characters with the proper symbols.
+
+```js
+const unescapeString = str =>
+  str.replace(/&gt;/g, '>').replace(/&lt;/g, '<').replace(/&#39;/g, '\'').replace(/&quot;/g, '"').replace(/&amp;/g, '&');
+```
+
+```js
+unescapeString('&lt;a href=&quot;#&quot;&gt;Me &amp; you&lt;/a&gt;'); // '<a href="#">Me & you</a>'
+```