Add a README.

Author: ticpu

README.md

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+Certainly! Below is a README template for your Unity package extractor tool, suitable for a GitHub repository:
+
+---
+
+# Unity Package Extractor
+
+Unity Package Extractor is a Rust-based tool designed to efficiently extract assets from `.unitypackage` files.
+
+## Some details
+
+The tool parses Unity package files and extracts all the files in the working directory. It uses Rust's async/await feature to handle file I/O operations efficiently. It assumes that assets are always written before the path name to more efficiently extract the file without using too much buffer space. It is a command-line based tool but you can drag and drop a file on it to quickly extract. There is also robust logging if you add a couple -v.