adding an initial Call activity

app/src/main/kotlin/com/simplemobiletools/contacts/pro/activities/CallActivity.kt

@@ -0,0 +1,25 @@
+package com.simplemobiletools.contacts.pro.activities
+
+import android.os.Bundle
+import com.simplemobiletools.commons.extensions.checkAppSideloading
+import com.simplemobiletools.commons.extensions.updateTextColors
+import com.simplemobiletools.contacts.pro.R
+import kotlinx.android.synthetic.main.activity_call.*
+
+class CallActivity : SimpleActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        supportActionBar?.hide()
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_call)
+
+        if (checkAppSideloading()) {
+            return
+        }
+    }
+
+    override fun onResume() {
+        super.onResume()
+        updateTextColors(call_holder)
+    }
+}