Added Error State Example.

Author: dlabaj

module.js

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+---
+# Sidenav top-level section
+# should be the same for all markdown files
+section: extensions
+# Sidenav secondary level section
+# should be the same for all markdown files
+id: extended-components
+# Tab (react | react-demos | html | html-demos | design-guidelines | accessibility)
+source: react
+# If you use typescript, the name of the interface to display props for
+# These are found through the sourceProps function provided in patternfly-docs.source.js
+propComponents: ['ErrorState']
+---
+
+import { ErrorState } from "@patternfly/extended-components";
+
+## Basic usage
+
+### Example
+
+```js file="./ErrorStateExample.tsx"
+
+```

packages/module/patternfly-docs/content/extensions/extended-components/examples/ErrorStateExample.md

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+import React from 'react';
+import { ErrorState } from '@patternfly/extended-components';
+
+export const BasicExample: React.FunctionComponent = () => <ErrorState errorTitle='A Basic Error' errorDescription='The following is an example of a basic error' />;