Added npm package readme

Author: SebastianWendorf

typescript/README.md

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+# jQAssistant TypeScript Language Concept Extractor
+
+This is the [LCE Tool](https://jqassistant-plugin.github.io/jqassistant-lce-docs/architecture/LCE-Tool) of the [TypeScript Plugin](https://github.com/jqassistant-plugin/jqassistant-typescript-plugin) for [jQAssistant](https://jqassistant.org).
+It provides means to extract language concepts from TypeScript code and export them to a JSON file.
+
+**For more information, refer to the [Documentation](https://jqassistant-plugin.github.io/jqassistant-typescript-plugin)**