add pages for uploading and help

pdb-js/src/app/main-page/main-page.component.ts

@@ -0,0 +1,15 @@
+import { Component, OnInit } from '@angular/core';
+
+@Component({
+  selector: 'pdb-main-page',
+  templateUrl: './main-page.component.html',
+  styleUrls: ['./main-page.component.scss']
+})
+export class MainPageComponent implements OnInit {
+
+  constructor() { }
+
+  ngOnInit() {
+  }
+
+}