Add README

Author: tetsurom

README.md

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+# PowerSyntax
+
+A modern syntax highlighting for PowerPoint.
+
+![Screen Shot](doc/PowerSyntax.png)
+
+## How it works?
+
+Run [highlight.js](https://highlightjs.org/) and extract font styles from its result.
+
+## Features
+
+* Generate native PowerPoint font styles. No need to install this add-in to play.
+* 185 languages and 89 styles (at 2019-07-11, thanks to [highlight.js](https://highlightjs.org/))
+
+## Installation
+
+Unzip and execute `PowerSyntax.vsto`.
+
+## Usage
+
+1. Choose language and theme.
+2. Select text or shape that contains text.
+3. Run "Apply Syntax Highlight" command.