Add extracted source directory and README navigation

extracted-source/node_modules/math-intrinsics/abs.js

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+'use strict';
+
+/** @type {import('./abs')} */
+module.exports = Math.abs;

extracted-source/node_modules/math-intrinsics/floor.js

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+'use strict';
+
+/** @type {import('./floor')} */
+module.exports = Math.floor;

extracted-source/node_modules/math-intrinsics/isNaN.js

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+'use strict';
+
+/** @type {import('./isNaN')} */
+module.exports = Number.isNaN || function isNaN(a) {
+	return a !== a;
+};

extracted-source/node_modules/math-intrinsics/max.js

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+'use strict';
+
+/** @type {import('./max')} */
+module.exports = Math.max;

extracted-source/node_modules/math-intrinsics/min.js

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+'use strict';
+
+/** @type {import('./min')} */
+module.exports = Math.min;

extracted-source/node_modules/math-intrinsics/pow.js

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+'use strict';
+
+/** @type {import('./pow')} */
+module.exports = Math.pow;

extracted-source/node_modules/math-intrinsics/round.js

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+'use strict';
+
+/** @type {import('./round')} */
+module.exports = Math.round;

extracted-source/node_modules/math-intrinsics/sign.js

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+'use strict';
+
+var $isNaN = require('./isNaN');
+
+/** @type {import('./sign')} */
+module.exports = function sign(number) {
+	if ($isNaN(number) || number === 0) {
+		return number;
+	}
+	return number < 0 ? -1 : +1;
+};