Add typings for cssbeautify library (#11460)

* Add typings for cssbeautify library

* Don't paper over the fact that cssbeautify isn't ES module compatible.

cssbeautify/cssbeautify-tests.ts

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+import cssbeautify = require('./index');
+
+var str = '';
+
+str = cssbeautify(str);
+
+str = cssbeautify(str, {});
+
+str = cssbeautify(str, {
+  indent: '  ',
+  openbrace: 'separate-line',
+  autosemicolon: true
+});

cssbeautify/index.d.ts

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+// Type definitions for CSS Beautify v0.3.1
+// Project: https://github.com/senchalabs/cssbeautify
+// Definitions by: rictic <https://github.com/rictic>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+interface Options {
+  /**
+   * A string used for the indentation of the declaration (default is 4
+   * spaces).
+   */
+  indent?: string;
+  /**
+   * Defines the placement of open curly brace, either end-of-line (default)
+   * or separate-line
+   */
+  openbrace?: 'end-of-line'|'separate-line';
+
+  /**
+   * Always inserts a semicolon after the last ruleset(default is false)
+   */
+  autosemicolon?: boolean;
+}
+declare function beautify(cssText: string, options?: Options): string;
+
+export = beautify;

cssbeautify/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "target": "es6",
+        "noImplicitAny": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "cssbeautify-tests.ts"
+    ]
+}