Added Chinese translation of README

README.md

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 # raylib-drawing
+[简体中文（未完成）](README_ZH.md)
 
 raylib is a simple and easy-to-use game library, yet it lacks 2d drawing functions. raylib-drawing provides the functions that raylib lacks.
 

README_ZH.md

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+# raylib-drawing
+[English](README.md)
+
+raylib是一个简单易用的游戏库，但它缺乏2D绘图功能。raylib-drawing提供了raylib所缺乏的功能。
+
+raylib-drawing由两个子库组成：
+ - `rdrawing.h` 2D绘图库
+ - `rturtle.h` 海龟图形库
+
+## rdrawing.h
+
+`rdrawing.h`提供了许多颜色定义和基本的2D绘图功能：
+
+以下程序可交互式地绘制并填充多边形。
+```
+#include "../src/rdrawing.h"
+#include <time.h>
+
+int main() {
+	InitWindow(800,600,"test");
+
+	Image img=GenImageColor(800,600,WHITE);
+
+	SetRandomSeed(time(NULL));
+	SetTraceLogLevel(LOG_WARNING);
+	int vx[200];
+	int vy[200];
+	int size=sizeof(vx)/sizeof(int);
+	SetTargetFPS(120);
+	int num=0;
+	while (!WindowShouldClose()) {
+		if (IsMouseButtonPressed(MOUSE_BUTTON_LEFT)) {
+			if (num<size) {
+				vx[num]=GetMouseX();
+				vy[num]=GetMouseY();
+				if (num>0)
+					ImageDrawLine(&img,vx[num-1],vy[num-1],vx[num],vy[num],BLACK);
+				ImageDrawPointEx(&img,vx[num],vy[num],3,BLUE);
+				num++;
+			}
+		}
+		if (IsKeyPressed(KEY_ENTER)) {
+			ImageFillPolygonEx(&img,vx,vy,num,LIGHTRED);
+			ImageDrawPolygonEx(&img,vx,vy,num,3,BLACK);
+			for (int i=0;i<num;i++) {
+				ImageDrawPointEx(&img,vx[i],vy[i],5,BLUE);				
+			}
+		}
+		if (IsKeyPressed(KEY_C)) {
+			num = 0;
+			ImageClearBackground(&img,WHITE);
+		}
+		Texture2D texture = LoadTextureFromImage(img);
+		BeginDrawing();
+		DrawTexture(texture,0,0,WHITE);
+
+		EndDrawing();
+		UnloadTexture(texture);
+	}
+	UnloadImage(img);
+	return 0;
+}
+```
+
+| 函数 | 用途 |
+|---|---|
+| ImageDrawPointEx		| 在图像上绘制点 |
+| ImageDrawArcEx		| 使用提供的线宽和颜色，在图像上绘制椭圆弧 |
+| ImageDrawLineEx		| 使用提供的线宽和颜色在图像上画一条线 |
+| ImageDrawPolylineEx	| 使用提供的线宽和颜色在图像上绘制折线。 |
+| ImageDrawRectangleEx  | 使用提供的线宽和颜色，在图像上绘制矩形轮廓 |
+| ImageDrawRoundRectEx  | 使用提供的线宽和颜色，在图像上绘制圆角矩形轮廓 |
+| ImageDrawCircleEx		| Draw a circle's outline to the image, using the provided line width and color |
+| ImageDrawEllipseEx	| Draw an ellipse's outline to the image, using the provided line width and color |
+| ImageDrawPolygonEx    | Draw a polygon's outline to the image, using the provided line width and color |
+| ImageFillCircleEx		| Fill a circle (no outline), using the provided fill color |
+| ImageFillEllipseEx    | Fill an ellipse (no outline), using the provided fill color |
+| ImageFillTriangleEx	| Fill a triangle (no outline), using the provided fill color |
+| ImageFillRectangleEx	| Fill a rectangle (no outline), using the provided fill color |
+| ImageFillRoundRectEx	| Fill a rounded rectangle (no outline), using the provided fill color |
+| ImageFillPolygonEx	| Fill a polygon (no outline), using the provided fill color |
+| ImageFillSectorEx		| Fill a ellipse sector (no outline), using the provided fill color |
+| ImageFloodFill		| Do a flood fill (stop at the pixels has the border color)|
+| ImageDrawCubicBezierEx | Draw a cubic bezier curve to the image, using the provided line width and color |
+| ImageSetJoinStyle     | Set line join style |
+| ImageGetJoinStyle     | Get line join style |
+
+## rturtle.h
+
+rturtle.h is an animated [turtle graphics](https://en.wikipedia.org/wiki/Turtle_graphics) library.
+
+```
+#include <rturtle.h>
+
+int main() {
+	int n;
+	initWorld(800,600);
+
+    setSpeed(500);
+
+	n=50;
+	for (int i=0;i<n;i++) {
+		for (int j=0;j<4;j++) {
+			fd(200);
+			lt(90);
+		}
+		lt(360.0/n);
+	}
+	waitClick();
+
+	closeWorld();
+	return 0;
+}
+```
+
+It also provided some interactive functions while drawing:
+ - Press F2 toggle show/hide of auxilary grids.
+ - Press F3 toggle show/hide of the turtle.
+ - Press F5 Capture the screen.
+
+| Function | Usage |
+|---|---|
+| initWorld		| Init the turtle world window |
+| closeWorld	| Destory the turtle world window |
+| forword / fd	| Move the turtle forward |
+| backward / bk	| Move the turtle backward |
+| leftTurn / lt | Turn the turtle's heading counter-clockwise (left) |
+| rightTurn / rt| Turn the turtle's heading clockwise (right) |
+| gotoXY		| let the turtle move to (x,y) |
+| turnTo		| turn the turtle's heading to angle |
+| faceXY		| turn the turtle heading to (x,y) |
+| arc           | Move the turtle to draw an arc |
+| clear         | Clear the canvas but don't move the turtle |
+| clearScreen / cs | Clear the canvas and set the turtle back to the origin|
+| home			| Move the turtle back to the origin, and heading to up |
+| waitClick		| Pause the program, until window closed or mouse left-clicked |
+| penDown / pd	| set the pen down |
+| penUp / pu	| set the pen up (turtle's movement won't have tracks)|
+| setPenDown 	| set the pen's donw/up status |
+| isPenDown		| query if the pen is down |
+| hide / show 	| hide/show the turtle |
+| setVisible	| set the turtle's visibility |
+| isVisible		| query if the turtle is visible |
+| setPenSize	| set the pen's size |
+| getPenSize	| get the pen's size |
+| setPenColor	| set the pen's color |
+| getPenColor	| get the pen's color |
+| setSpeed		| set the turtle's move speed |
+| getSpeed		| get the turtle's move speed |
+| setRewind		| set if the turtle should rewind when hit borders |
+| isRewind		| query if the turtle should rewind |
+| setImmediate	| set if the turtle's moves should be animated |
+| isImmediate	| query if the turtle's moves should be animated |
+| setXY			| set the turtle's position to (x,y) |
+| setHeading	| set the turtle's heading |
+| getX			| get the turtle's position's x-coordination |
+| getY			| get the turtle's position's y-coordination |
+| getAngle / getHeading | get the turtle's heading angle|
+| getState		| get the turtle's state |
+| setState		| set the turtle's state |
+| setOrigin		| set the origin to (x,y) |
+| setCaption	| set the window's caption |
+| setBackgroundImage | set the window's background image |
+| setBackgroundImageFile | Load image from the file, and set the window's background image to it |
+| setBackgroundColor | set the canvas's background color |
+| getBackgroundColor | get the canvas's background color |
+| createGrids		| create auxilary grids |
+| removeGrids		| remove auxilary grids | 
+| beginFill / endFill |  fill the polygon generated by turtle's move |
+| fill				| flood fill (stop at pixels that has different color from the current pixel) |
+| fillToBorder		| flood fill (stop at pixels that has the border color) |
+| drawPoint			| draw a point |
+| drawLine			| draw a line  |
+| drawEllipse		| draw an ellipse's outline |
+| fillEllipse		| fill an ellipse |