Add introduce page at index.

index.md

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 # Hello karaoke!
 
-This website record most of change about karaoke ruleset.
+[![GitHub last commit](https://img.shields.io/github/last-commit/osu-karaoke/osu-karaoke)](https://github.com/osu-Karaoke)
+[![dev chat](https://discordapp.com/api/guilds/299006062323826688/widget.png?style=shield)](https://discord.gg/ga2xZXk)
+[![NuGet](https://img.shields.io/badge/ChangeLog-here-aaaaaa.svg)](https://osu-karaoke.github.io/changelog/README.html)
+[![NuGet](https://img.shields.io/badge/月子我婆-passed-ff69b4.svg)](https://github.com/osu-Karaoke/osu-karaoke)
+
+This is the `osu!karaok`'s offical site.
+
+This ruleset is based on `osu!`, and it's a part of un-official osu ruleset(gamemode).
+
+It's still in wip, anything news will be update in here.
+
+## What's the feature in this ruleset?
+
+- Base karaoke feature, display lyric with simple animation.
+- Song selection.
+- Saiten(scoring) system.
+- Support japanese.
+- Cross platform, you can run it in pc and mobile device.
+
+## What's the feature other karaoke software don't have 
+
+- More complex lyric animation.
+- Will support most language.
+- Karoake beatmap with translate support.
+- Romaji support so you can sing the song all over the world.
+- Beautiful UI/UX.
+- Writtin in C#, best programming language.
+- Running in most popular rhythm game platform.
+- Create your own karaoke beatmap.
+- Complex skin system.
+- It's open source, means can add anything if you like, even added by yourself.
+- It's open source, it's always the beginning, always can be stronger.
+- It will be the best karaoke system in the world.