Added posts and categories

post.model.js

@@ -0,0 +1,31 @@
+const mongoose = require('mongoose');
+const Schema = mongoose.Schema;
+
+// Database schema for an email message
+let Post = new Schema({
+    title: {
+        type: String
+    },
+    description: {
+        type: String
+    },
+    author: {
+        type: String
+    },
+    category: {
+        type: Array
+    },
+    link: {
+        type: String
+    }, 
+    date: {
+        type: Date
+    },
+    photo: {
+        type: String
+    }
+}, {
+    collection: 'posts'
+});
+
+module.exports = mongoose.model('Post', Post);