Add README.md

Author: marcusolsson

README.md

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+# DTS Docs
+
+A command-line tool for generating Markdown documentation for a `.d.ts` file.
+
+This tool is used to generate the API reference documentation for the unofficial [plugin development guide for Obsidian](https://marcus.se.net/obsidian-plugin-docs/).
+
+**IMPORTANT:** This is **NOT** fit for production use. Use at your own risk.
+
+## Usage
+
+```bash
+yarn install
+yarn generate --input ./definitions.d.ts --output ./docs
+```