Add extracted source directory and README navigation

extracted-source/node_modules/is-wsl/index.js

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+import process from 'node:process';
+import os from 'node:os';
+import fs from 'node:fs';
+import isInsideContainer from 'is-inside-container';
+
+const isWsl = () => {
+	if (process.platform !== 'linux') {
+		return false;
+	}
+
+	if (os.release().toLowerCase().includes('microsoft')) {
+		if (isInsideContainer()) {
+			return false;
+		}
+
+		return true;
+	}
+
+	try {
+		return fs.readFileSync('/proc/version', 'utf8').toLowerCase().includes('microsoft')
+			? !isInsideContainer() : false;
+	} catch {
+		return false;
+	}
+};
+
+export default process.env.__IS_WSL_TEST__ ? isWsl : isWsl();