feat: Adding loads and load-attachments endpoints

lib/Models/load-attachments.model.js

@@ -0,0 +1,19 @@
+const mongoose = require('mongoose');
+const { Schema } = mongoose;
+
+const schema = new Schema({
+    status: { type: String, default: 'Draft', enum: ['Draft', 'Done'] },/*Once in Done state, no changes are allowed.*/
+    updatedAt: {
+        type: Date,
+        default : () => Date.now()
+    },
+    type: { type: String, enum: ['Loading', 'Downloading'], required : true },
+    company: { type: Schema.Types.ObjectId, ref: 'companies' }, //shipper
+    carrier: { type: Schema.Types.ObjectId, ref: 'companies', required: true }, // carrier
+    load: { type: Schema.Types.ObjectId, ref: 'loads', required: true },
+    author: { type: Schema.Types.ObjectId, ref: 'users', required: true },
+    doneAt: { type: Date }
+});
+
+module.exports = mongoose.model( "loadattachments", schema );
+