add collision readme

docs/collision.md

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+# Collision
+碰撞检测在大多数游戏中都很常见。框架内使用了一些更先进的碰撞/重叠检查方法，如Minkowski、分离轴定理和古老的三角法
+
+## 线与线相交 [lineToLine]
+- 返回是否相交
+```typescript
+const a1 = new es.Vector2(0, 0);
+const a2 = new es.Vector2(100, 100);
+const b1 = new es.Vector2(-100, 0);
+const b2 = new es.Vector2(100, 200);
+const result = es.Collisions.lineToLine(a1, a2, b1, b2);
+```
+- 返回是否相交并获得相交的点
+```typescript
+const a1 = new es.Vector2(0, 0);
+const a2 = new es.Vector2(100, 100);
+const b1 = new es.Vector2(-100, 0);
+const b2 = new es.Vector2(100, 200);
+// 相交的点坐标
+const intersection = new es.Vector2();
+const result = es.Collisions.lineToLineIntersection(a1, a2, b1, b2, intersection);
+```
+
+## 圆和圆相交 [circleToCircle]
+```typescript
+const center1 = new es.Vector2(0, 0);
+const radius1 = 50;
+const center2 = new es.Vector2(30, 30);
+const radius2 = 50;
+const result = es.Collisions.circleToCircle(center1, radius1, center2, radius2);
+```
+
+## 圆和线相交 [circleToLine]
+```typescript
+const center1 = new es.Vector2(0, 0);
+const radius1 = 50;
+const a1 = new es.Vector2(0, 0);
+const a2 = new es.Vector2(100, 100);
+const result = es.Collisions.circleToLine(center1, radius1, a1, a2);
+```
+
+## 点是否在圆内 [circleToPoint]
+```typescript
+const center1 = new es.Vector2(0, 0);
+const radius1 = 50;
+const point = new es.Vector2(0, 0);
+const result = es.Collisions.circleToPoint(center1, radius1, point);
+```
+
+## 圆是否和矩形相交 [rectToCircle]
+```typescript
+const rect = new es.Rectangle(0, 0, 100, 100);
+const center = new es.Vector2(30, 30);
+const radius = 50;
+const result = es.Collisions.rectToCircle(rect, center, radius);
+```
+
+## 矩形与线是否相交 [rectToLine]
+```typescript
+const rect = new es.Rectangle(0, 0, 100, 100);
+const a1 = new es.Vector2(0, 0);
+const a2 = new es.Vector2(100, 100);
+const result = es.Collisions.rectToLine(rect, a1, a2);
+```
+
+## 点是否在矩形内 [rectToPoint]
+```typescript
+const point = new es.Vector2(100, 100);
+const result = es.Collisions.rectToPoint(0, 0, 100, 100, point);
+```