Added CRUD API and UI for creature folders

app/imports/api/creature/creatureFolders/methods.js/insertCreatureFolder.js

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+import CreatureFolders from '/imports/api/creature/creatureFolders/CreatureFolders.js';
+import { ValidatedMethod } from 'meteor/mdg:validated-method';
+import { RateLimiterMixin } from 'ddp-rate-limiter-mixin';
+
+const insertCreatureFolder = new ValidatedMethod({
+  name: 'creatureFolders.methods.insert',
+  validate: null,
+  mixins: [RateLimiterMixin],
+  rateLimit: {
+    numRequests: 5,
+    timeInterval: 5000,
+  },
+  run() {
+    // Ensure logged in
+    let userId = this.userId;
+    if (!userId) {
+      throw new Meteor.Error('creatureFolders.methods.insert.denied',
+      'You need to be logged in to insert a folder');
+    }
+    // Limit folders to 50 per user
+    let existingFolders = CreatureFolders.find({
+      owner: userId
+    }, {
+      fields: {order: 1},
+      sort: {order :-1}
+    });
+    if (existingFolders.count() >= 50){
+      throw new Meteor.Error('creatureFolders.methods.insert.denied',
+      'You can not have more than 50 folders');
+    }
+    // Make the new folder the last in the order
+    let order = 0;
+    let lastFolder = existingFolders.fetch()[0];
+    if (lastFolder){
+      order = (lastFolder.order || 0) + 1;
+    }
+    // Insert
+    return CreatureFolders.insert({
+      owner: userId,
+      order,
+    });
+  },
+});
+
+export default insertCreatureFolder;