add splash screen activity

app/src/main/java/com/illusionware/npsbrowser/activities/SplashActivity.kt

@@ -0,0 +1,36 @@
+package com.illusionware.npsbrowser.activities
+
+import android.content.Intent
+import android.os.Bundle
+import android.view.View
+import com.illusionware.npsbrowser.activities.mainactivity.MainActivity
+
+class SplashActivity : BaseActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        startActivity(Intent(this, MainActivity::class.java))
+        finish()
+    }
+
+    override fun onWindowFocusChanged(hasFocus: Boolean) {
+        super.onWindowFocusChanged(hasFocus)
+        if (hasFocus) hideSystemUI()
+    }
+
+    private fun hideSystemUI() {
+        // Enables regular immersive mode.
+        // For "lean back" mode, remove SYSTEM_UI_FLAG_IMMERSIVE.
+        // Or for "sticky immersive," replace it with SYSTEM_UI_FLAG_IMMERSIVE_STICKY
+        window.decorView.systemUiVisibility = (View.SYSTEM_UI_FLAG_IMMERSIVE
+                // Set the content to appear under the system bars so that the
+                // content doesn't resize when the system bars hide and show.
+                or View.SYSTEM_UI_FLAG_LAYOUT_STABLE
+                or View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
+                or View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
+                // Hide the nav bar and status bar
+                or View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
+                or View.SYSTEM_UI_FLAG_FULLSCREEN)
+    }
+}