Add JSDoc configuration

Added the configuration and script in package.json. Also modified
.gitignore to ignore the output.

Author: dmaccormack

.gitignore

@@ -5,6 +5,9 @@ node_modules/
 dist/
 coverage/
 
+# jsdoc output
+apidoc/
+
 # Eclipse
 .project
 .settings/

jsdoc.config.js

@@ -0,0 +1,37 @@
+/*
+  MIT License
+
+  Copyright (c) 2020 David MacCormack
+
+  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:
+
+  The above copyright notice and this permission notice shall be included in all
+  copies or substantial portions of the Software.
+
+  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.
+*/
+
+"use strict";
+
+module.exports = {
+  source: {
+    include: ["README.md", "src"],
+    includePattern: ".+\\.(js|md)$",
+    excludePattern: ".test.js$",
+  },
+  sourceType: "module",
+  opts: {
+    destination: "./apidoc",
+  },
+};