add readme

README.md

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+<p align="center">
+    <img width="100" alt="PpdEditor Logo" src="https://raw.githubusercontent.com/fralonra/ppd-editor/master/build/logo/ppd-editor.svg">
+</p>
+
+<h1 align="center">PpdEditor</h1>
+
+Editor and viewer for [paperdoll](https://github.com/fralonra/paperdoll), a 2D pixel-based stationary paper doll model.
+
+<p align="center">
+  <img src="https://raw.githubusercontent.com/fralonra/ppd-editor/master/resources/docs/ppd-editor.png" alt="ppd-editor-preview">
+  <small style="color: gray;">PpdEditor</small>
+</p>
+
+<p align="center">
+  <img src="https://raw.githubusercontent.com/fralonra/ppd-editor/master/resources/docs/ppd-viewer.png" alt="ppd-viewer-preview">
+  <small style="color: gray;">PpdViewer</small>
+</p>
+
+## Installation
+
+Check the [latest release](https://github.com/fralonra/wgshadertoy/releases) for your specific OS.