Update "main" from "lib" to "three-csg.js" in package.json

.gitignore

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+.idea
+node_modules
+lib
+types

LICENSE

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-The MIT License
+Zlib License
 
-Copyright (c) 2012 Chandler Prall. All rights reserved.
+Copyright © 2018 Chandler Prall
 
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any damages
+arising from the use of this software.
 
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
 
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
+1. The origin of this software must not be misrepresented; you must not
+   claim that you wrote the original software. If you use this software
+   in a product, an acknowledgment in the product documentation would be
+   appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not be
+   misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.

README.md

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+Constructive Solid Geometry library for Three.js
+
+## Installation
+
+### npm/yarn
+
+`npm install --save three-csg`
+
+`yarn add [email protected]`
+
+### Manually
+
+The top-level `three-csg.js` file in this repo is a UMD build you can copy into your project and include via a `<script>` tag, or by `require()`ing it in commonjs-enabled environments like `node` and `webpack`.
+
+## Usage
+
+There are three methods on the top level library: `union`, `intersect`, and `subtract`. Each takes the target meshes as arguments and optionally a material to apply to the new mesh as the third.
+
+The operations take into account any translation, rotation, and scaling transforms on the source meshes and are non-destructive, leaving the original meshes fully intact. The resulting geometry is centered in its bounding box and the new mesh is positioning relative to the original objects.
+
+### Example   
+
+```javascript
+// assuming Three.js and threecsg have been included
+// either by a <script> tag or require()ing them
+
+const box = new THREE.Mesh(new THREE.BoxGeometry(1, 1, 1));
+const sphere = new THREE.Mesh(new THREE.SphereGeometry(1));
+sphere.position.y = 0.5; // sit the sphere's center on top of box
+
+const material = new THREE.MeshNormalMaterial();
+
+const unionmesh = threecsg.union(box, sphere, material); // combine box and sphere
+const intersectmesh = threecsg.intersect(box, sphere, material); // find intersection of box and sphere
+const subtractmesh = threecsg.subtract(box, sphere, material); // removes parts of box that don't overlap with sphere
+```