Add example how the importer can work better

examples/importingExample.js

@@ -0,0 +1,67 @@
+// RUN with `npx babel-node importingExample.js`
+
+import BehaviorTree from '../src/BehaviorTree'
+import Decorator from '../src/Decorator'
+import Selector from '../src/Selector'
+import BehaviorTreeImporter from '../src/BehaviorTreeImporter'
+import Task from '../src/Task'
+import { SUCCESS, FAILURE } from '../src/constants'
+
+class CanJumpDecorator extends Decorator {
+  nodeType = 'CanJumpDecorator';
+
+  decorate (run, blackboard) {
+    if (blackboard[this.config.check]) return run()
+    return FAILURE
+  }
+};
+
+BehaviorTree.register('selector', Selector)
+
+BehaviorTree.register('walk', new Task({
+  run: function (blackboard) {
+    console.log('walk…')
+    return SUCCESS
+  }
+}))
+
+BehaviorTree.register('jump', new Task({
+  run: function (blackboard) {
+    console.log('jump…')
+    return SUCCESS
+  }
+}))
+
+const treeJson = {
+  'type': 'selector',
+  'name': 'the root',
+  'nodes': [
+    {
+      'type': 'canJump',
+      'name': 'can I jump?',
+      'check': 'isJumping',
+      'node': { 'type': 'jump', 'name': 'jump up' }
+    },
+    { 'type': 'walk', 'name': 'just walking' }
+  ]
+}
+const importer = new BehaviorTreeImporter()
+
+importer.defineType('canJump', CanJumpDecorator)
+
+const blackboard = {
+  isJumping: true
+}
+
+const tree = new BehaviorTree({
+  tree: importer.parse(treeJson),
+  blackboard
+})
+
+tree.step()
+// logs jump
+
+blackboard.isJumping = false
+
+tree.step()
+// logs walk