Create Fragments for settings

One fragment for every tab, openable with a swipe. The middle tab 
'theme' still has to be filled.

app/src/main/java/com/finnmglas/launcher/SettingsFragmentApps.kt

@@ -0,0 +1,20 @@
+package com.finnmglas.launcher
+
+import android.os.Bundle
+import androidx.fragment.app.Fragment
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+
+/** The 'Apps' Tab associated Fragment in Settings */
+
+class SettingsFragmentApps : Fragment() {
+
+    override fun onCreateView(
+        inflater: LayoutInflater, container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+
+        return inflater.inflate(R.layout.fragment_settings_apps, container, false)
+    }
+}

app/src/main/java/com/finnmglas/launcher/SettingsFragmentLauncher.kt

@@ -0,0 +1,20 @@
+package com.finnmglas.launcher
+
+import android.os.Bundle
+import androidx.fragment.app.Fragment
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+
+/** The 'Launcher' Tab associated Fragment in Settings */
+
+class SettingsFragmentLauncher : Fragment() {
+
+    override fun onCreateView(
+        inflater: LayoutInflater, container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+
+        return inflater.inflate(R.layout.fragment_settings_launcher, container, false)
+    }
+}

app/src/main/java/com/finnmglas/launcher/SettingsFragmentTheme.kt

@@ -0,0 +1,20 @@
+package com.finnmglas.launcher
+
+import android.os.Bundle
+import androidx.fragment.app.Fragment
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+
+/** The 'Theme' Tab associated Fragment in Settings */
+
+class SettingsFragmentTheme : Fragment() {
+
+    override fun onCreateView(
+        inflater: LayoutInflater, container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+
+        return inflater.inflate(R.layout.fragment_settings_theme, container, false)
+    }
+}

app/src/main/java/com/finnmglas/launcher/ui/main/SectionsPagerAdapter.kt

@@ -18,6 +18,9 @@ class SectionsPagerAdapter(private val context: Context, fm: FragmentManager)
 
     override fun getItem(position: Int): Fragment {
         return when (position){
+            0 -> SettingsFragmentApps()
+            1 -> SettingsFragmentTheme()
+            2 -> SettingsFragmentLauncher()
             else -> Fragment()
         }
     }