updated README

prepare for github system.

Change-Id: I0ee45e3ccb56f25f0252aad91a48151d62f9ed02

README

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-Thor Vector Graphics 0.1.0
-
-******************************************************************************
-
- FOR ANY ISSUES PLEASE EMAIL:
-
-******************************************************************************

README.md

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+# ThorVG
+
+ThorVG is a platform independent standalone C++ library for drawing vector-based shapes and SVG.
+
+#
+## Contents
+- [Building ThorVG](#building-thorvg)
+	- [Meson Build](#meson-build)
+- [Quick Start](#quick-start)
+- [Issues or Feature Requests?](#issues-or-feature-requests)
+#
+## Building ThorVG
+thorvg supports [meson](https://mesonbuild.com/) build system.
+#
+### Meson Build
+install [meson](http://mesonbuild.com/Getting-meson.html) and [ninja](https://ninja-build.org/) if not already installed.
+
+Run meson to configure ThorVG.
+```
+meson build
+```
+Run ninja to build & install ThorVG.
+```
+ninja -C build install
+```
+[Back to contents](#contents)
+#
+## Quick Start
+ThorVG renders vector shapes on a given canvas buffer.
+
+You can initialize ThorVG engine first:
+```cpp
+tvg::Initializer::init(tvg::CanvasEngine::Sw);
+```
+You can prepare a empty canvas for drawing on it.
+```cpp
+static uint32_t buffer[WIDTH * HEIGHT];          //canvas target buffer
+
+auto canvas = tvg::SwCanvas::gen();              //generate a canvas
+canvas->target(buffer, WIDTH, WIDTH, HEIGHT);    //stride, w, h
+```
+
+Next you can draw shapes onto the canvas.
+```cpp
+auto shape = tvg::Shape::gen();             //generate a shape
+shape->appendRect(0, 0, 200, 200, 0, 0);    //x, y, w, h, rx, ry
+shape->appendCircle(400, 400, 100, 100);    //cx, cy, radiusW, radiusH
+shape->fill(255, 255, 0, 255);              //r, g, b, a
+
+canvas->push(move(shape));                  //push shape drawing command
+```
+Begin rendering & finish it at a particular time.
+```cpp
+canvas->draw();
+canvas->sync();
+```
+Lastly, you can acquire the rendered image in buffer memory.
+
+[Back to contents](#contents)
+#
+## Issues or Feature Requests?
+For immidiate assistant or support please reach us in [Gitter](https://gitter.im/thorvg-dev/community#)