Fresh new README file with licensing details

Author: sukibaby

README.md

@@ -1,2 +1,92 @@
 # ArrowVortex
- Stepmania .sm/.ssc file development tool
+
+ArrowVortex is a simfile editor for Windows. It can be used to create or edit stepfiles for various rhythm games, such as StepMania, ITG, osu!, and other games which support DDR-style and/or PIU-style panel layouts.
+
+This is a continuation of the original project by Bram 'Fietsemaker' van de Wetering. He has graciously allowed for the open sourcing of this code so that development can continue.
+
+See the [About this project](#about-this-project) section below for more information about this repository.
+
+## Features
+
+Some of the features that ArrowVortex has to offer include:
+
+- Automatic BPM/offset detection
+- Automatic stream generation
+- Automatic difficulty estimation
+- Full editing history with undo/redo
+- Dancing Bot: plays your charts using two virtual feet
+- Powerful editing tools: copy/paste/mirror/expand/compress/etc.
+- Scrollable minimap with chart preview, for easy navigation
+- Supports Ogg Vorbis conversion for MP3/WAV files
+   - requires any version of `oggenc2.exe`, available from [RareWares](https://www.rarewares.org/ogg-oggenc.php)
+- Fully customizable shortcuts
+- Customizable game styles and noteskins
+
+The following features are exclusive to the newer versions of ArrowVortex provided here:
+
+- Support for Fake and Lift note types
+  - New "Convert" menu options for converting to Fakes or Lifts
+- Timestamps can be copied and pasted
+- Support for custom snaps
+- Non-destructive paste option (Shift+Ctrl+V)
+- New visual sync feature, inspired by DDreamStudio (sub-beat placement)
+- Wider range and finer granularity in zooming
+- Replaced the fixed Mini options with a slider
+
+## Supported formats
+
+Audio formats:
+- Ogg Vorbis (.ogg)
+- MPEG-1 Audio Layer III (.mp3)
+- Waveform Audio File Format (.wav)
+
+Simfile formats:
+
+- StepMania/ITG (.sm)
+- StepMania 5 (.ssc)
+- Dance With Intensity (.dwi)
+- osu! (.osu)
+
+Game styles:
+
+- Dance Single
+- Dance Double
+- Dance Couple
+- Dance Routine
+- Dance Solo
+- Pump Single
+- Pump Halfdouble
+- Pump Double
+- Pump Couple
+
+## About this project
+
+Unfortunately, the source code for the most recent version of ArrowVortex has been lost to time. The only surviving archive of source code was a development snapshot from 2016. A small group of volunteer developers put a lot of time and effort into restoring the full functionality of the latest release of ArrowVortex, released on 2017-02-25.
+
+Some new features were introduced as well when preparing this release.
+
+## License
+
+ArrowVortex is provided under the GPLv3 license, or at your option, any later version.
+
+The original author (Fietsemaker) provided the volunteer developers with an archive of the source code, which did not include a formal license. The original author explicitly requested that any new code developed by the volunteer developers be released under a license which prevents the code from being used in closed source software. The volunteer developers, as a separate party, have acted in good faith to comply with this request and bear no liability for the licensing status of the original code as provided to them.
+
+Additionally, code from the following projects is included in this repository:
+- [freetype](https://freetype.org/license.html), using the FreeType License, which is compatible with GPLv3
+- [libogg & libvorbis](https://gitlab.xiph.org/xiph), using its BSD-style license, which is compatible with GPLv3
+- [libmad](https://www.underbit.com/products/mad/), using the GPL license (libmad allows for GPLv2 or any later version)
+- [lua](https://www.lua.org/license.html), using its GPLv3-compatible permissive license
+
+Please see inside the `lib/` directory for more specific licensing details regarding these libraries.
+
+## Contributors
+
+Original author:
+- Bram 'Fietsemaker' van de Wetering (original author)
+
+The following people helped prepare the initial public release of the open sourced ArrowVortex:
+- @uvcat7
+- @sukibaby
+- @Psycast
+- @DeltaEpsilon7787
+- @DolphinChips