Add readme and assembly info.

Assets/AssemblyInfo.cs

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+using System.Reflection;
+
+[assembly: AssemblyCompany("Cryville")]
+[assembly: AssemblyCopyright("Copyright © Cryville 2020-2022")]
+[assembly: AssemblyDefaultAlias("Cosmo Resona")]
+[assembly: AssemblyProduct("Cosmo Resona")]
+[assembly: AssemblyTitle("Cosmo Resona")]
+[assembly: AssemblyVersion("0.5.0")]

Assets/AssemblyInfo.cs.meta

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+fileFormatVersion: 2
+guid: a69a6c726b01961419c4835bba37a218
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

README.md

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+# #P055 [crtr]
+A rhythm game project. Open-sourced only for technology exchange. All rights reserved by Cryville.
+
+一个音乐游戏项目。开源仅限技术交流。Cryville 保留所有权利。