Merge pull request sakura-editor#9 from sakura-editor/readme

Create README.md

README.md

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+# Sakura Editor
+A free Japanese text editor for Windows
+
+## Web Site
+- [Sakura Editor Portal](http://sakura-editor.sourceforge.net/)
+- [SourceForge Project Home](https://sourceforge.net/projects/sakura-editor/)
+
+## Status
+SourceForge から当 GitHub への移行検証中。
+
+## Build Requirements
+### Visual Studio Community 2017
+- [Visual Studio Community 2017](https://www.visualstudio.com/downloads/)
+
+#### Visual Studio Install options required
+- Windows SDK
+- Windows XP Support for C++
+- C++に関するWindows XP サポート
+
+More information: https://github.com/sakura-editor/sakura/issues/6
+
+## How to build
+Visual Studio Community 2017 で `sakura/sakura_vc2017.sln` を開いてビルド。