Add importing and links sections

Author: thelonious

README.md

@@ -1,7 +1,55 @@
 # kld-contours
 
+- [Installation](#installation)
+- [Importing](#importing)
+- [API](#api)
+- [Links and Related Projects](#links-and-related-projects)
+
+---
+
 A collection of classes to represent and manipulate various vector shapes
 
+# Installation
+
+```
+npm install kld-contours
+```
+
+# Importing
+
+The following sections indicate how you can import the code for use in various environments.
+
+## Node
+
+```javascript
+import {CubicBezier2D, QuadraticBezier2D, Rectangle2D} = require("kld-contours");
+```
+
+## ESM in Modern Browsers
+
+```javascript
+import {CubicBezier2D, QuadraticBezier2D, Rectangle2D} from './node_modules/kld-contours/dist/index-esm.js';
+```
+
+## Older Browsers
+
+```html
+<script src="./node_modules/kld-contours/dist/index-umd.js"></script>
+<script>
+  var CubicBezier2D = KldContours.CubicBezier2D;
+  var QuadraticBezier2D = KldContours.QuadraticBezier2D;
+  var Rectangle2D = KldContours.Rectangle2D;
+</script>
+```
+
+## Bundlers
+
+```javascript
+import {CubicBezier2D, QuadraticBezier2D, Rectangle2D} from "kld-contours";
+```
+
+# API
+
 ## BoundingBox2D
 
 - overlaps
@@ -56,3 +104,9 @@ A collection of classes to represent and manipulate various vector shapes
 
 - getBoundingBox
 - toPolygon2D
+
+# Links and Related Projects
+
+- [kld-affine](https://github.com/thelonious/kld-affine)
+- [kld-polynomial](https://github.com/thelonious/kld-polynomial)
+- [kld-intersections](https://github.com/thelonious/kld-intersections)