Pull current track from Redux store

Fixes #40

src/store/player/index.ts

@@ -1,10 +1,26 @@
-import { createSlice } from '@reduxjs/toolkit';
+import { createSlice, PayloadAction } from '@reduxjs/toolkit';
+import { Track } from 'react-native-track-player';
+
+interface State {
+    addedTrackCount: number,
+    currentTrack: Track | undefined,   
+}
+
+const initialState: State = {
+    addedTrackCount: 0,
+    currentTrack: undefined,
+};
 
 const player = createSlice({
     name: 'player',
-    initialState: 0,
+    initialState,
     reducers: {
-        addNewTrackToPlayer: (state) => state + 1,
+        addNewTrackToPlayer: (state) => {
+            state.addedTrackCount += 1;
+        },
+        setCurrentTrack: (state, action: PayloadAction<Track | undefined>) => {
+            state.currentTrack = action.payload;
+        },
     }
 });