fix: android splash screen

Author: WrathChaos

android/app/src/main/java/com/rntypescriptboilerplate/MainActivity.java

@@ -1,11 +1,16 @@
 package com.rntypescriptboilerplate;
-
+import android.os.Bundle;
 import com.facebook.react.ReactActivity;
 import com.facebook.react.ReactActivityDelegate;
 import com.facebook.react.ReactRootView;
+import org.devio.rn.splashscreen.SplashScreen;
 
 public class MainActivity extends ReactActivity {
-
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        SplashScreen.show(this);
+        super.onCreate(savedInstanceState);
+    }
   /**
    * Returns the name of the main component registered from JavaScript. This is used to schedule
    * rendering of the component.

android/app/src/main/res/layout/launch_screen.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+                android:orientation="vertical" android:layout_width="match_parent"
+                android:layout_height="match_parent">
+    <ImageView android:layout_width="match_parent" android:layout_height="match_parent" android:src="@drawable/launch_screen" android:scaleType="centerCrop" />
+</RelativeLayout>

android/app/src/main/res/values/colors.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="primary_dark">#000000</color>
+</resources>