Add README.md with sample usage

README.md

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+# qbt-theme
+
+## Tool to crate .qbttheme files for [qBittorrent](https://www.qbittorrent.org/).
+
+### Requirements
+
+- [rcc](https://pypi.org/project/PySide2/) to compile `.qres` binary resource files
+  - on Windows rcc.exe should be added to the PATH (`pip show PySide2` to get the installation path)
+
+#### For development
+
+- [qtsass](https://pypi.org/project/qtsass/) to compile SCSS
+
+### Usage
+
+#### Get help
+
+``` sh
+$ python make-resource.py -h
+```
+
+### Compile `material-white/stylesheet.scss` to `stylesheet.qss`
+
+``` sh
+$ cd material-white
+$ python
+>>> import qtsass
+>>> qtsass.compile_filename('stylesheet.scss', 'stylesheet.qss')
+```
+
+
+#### Compile the `ubuntu` theme to a file called `test.qbtheme`
+
+``` sh
+$ python make-resource.py -s a -o test files ubuntu/*
+```