Refactored the Startup Setup into A new Struct

- Added A new Struct Application which has all the other components as
  its fields
  -- the `newApplication()` Function returns a pointer to the newly
  created Application from which other fields can be accessed. The
  fields are as follows

	|   App          *tview.Application
	|   expandedView *tview.Table
	|   Navbar       *tview.Table
	|   searchBar    *tview.Table
	|   pBar         *progressBar

- Minor changes to main.go

App.go

@@ -0,0 +1,55 @@
+package main
+
+import (
+	"github.com/fhs/gompd/mpd"
+	"github.com/rivo/tview"
+)
+
+type Application struct {
+	App          *tview.Application
+	expandedView *tview.Table
+	Navbar       *tview.Table
+	searchBar    *tview.Table
+	pBar         *progressBar
+}
+
+func newApplication(conn mpd.Client) *Application {
+
+	var pBar *progressBar = newProgressBar(conn)
+	expandedView := tview.NewTable()
+	Navbar := tview.NewTable()
+	searchBar := tview.NewTable()
+
+	searchBar.SetBorder(true).SetTitle("Search").SetTitleAlign(tview.AlignLeft)
+	Navbar.SetBorder(true)
+	Navbar.SetSelectable(true, false)
+	Navbar.SetCell(0, 0, tview.NewTableCell("PlayList"))
+	Navbar.SetCell(1, 0, tview.NewTableCell("Files"))
+	Navbar.SetCell(2, 0, tview.NewTableCell("Most Played"))
+
+	searchNavFlex := tview.NewFlex().SetDirection(tview.FlexRow).
+		AddItem(searchBar, 0, 1, false).
+		AddItem(Navbar, 0, 7, false)
+
+	sNavExpViewFlex := tview.NewFlex().
+		AddItem(searchNavFlex, 0, 1, false).
+		AddItem(expandedView, 0, 4, false)
+
+	mainFlex := tview.NewFlex().SetDirection(tview.FlexRow).
+		AddItem(sNavExpViewFlex, 0, 8, false).
+		AddItem(pBar.t, 0, 1, false)
+
+	expandedView.SetBorderPadding(1, 1, 1, 1).SetBorder(true)
+	expandedView.SetSelectable(true, false)
+
+	App := tview.NewApplication()
+	App.SetRoot(mainFlex, true).SetFocus(expandedView)
+
+	return &Application{
+		App:          App,
+		expandedView: expandedView,
+		Navbar:       Navbar,
+		searchBar:    searchBar,
+		pBar:         pBar,
+	}
+}