Delete MainActivity.kt

app/src/main/java/chat/rocket/android/app/MainActivity.kt

-package chat.rocket.android.app
-
-import android.os.Bundle
-import android.support.v7.app.AppCompatActivity
-import chat.rocket.android.R
-import chat.rocket.android.app.chatlist.ChatListFragment
-import chat.rocket.android.util.addFragment
-
-class MainActivity : AppCompatActivity() {
-
-    override fun onCreate(savedInstanceState: Bundle?) {
-        super.onCreate(savedInstanceState)
-        setContentView(R.layout.activity_main)
-
-        addFragment("ChatListFragment", R.id.fragment_container) {
-            ChatListFragment()
-        }
-    }
-}
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