Update README.md

README.md

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 # linuxdeployqt
 
-__This is not working yet.__ Help is appreciated.
+linuxdeployqt takes an application as input and makes it self-contained by copying in the Qt libraries and plugins that the application uses.
+
+__This is not fully working yet.__ Help is appreciated.
+
+## Installation
+
+* Open in Qt Creator and build
+* Build and install [patchelf](https://nixos.org/patchelf.html) (linuxdeployqt uses it to rewrite paths inside the binaries similar to `install_name_tool` on macOS)
+
+## Usage
 
 ```
 Usage: linuxdeployqt app-binary [options]