add a hint that self-avatar is not completely working as expected

src/org/thoughtcrime/securesms/CreateProfileActivity.java

@@ -182,6 +182,9 @@ public class CreateProfileActivity extends BaseActionBarActivity {
         break;
       case Crop.REQUEST_CROP:
         if (resultCode == Activity.RESULT_OK) {
+
+          Toast.makeText(CreateProfileActivity.this, "Sending profile picture to others is not yet implemented.\n\nWe're working on it, stay tuned :)", Toast.LENGTH_LONG).show();
+
           new AsyncTask<Void, Void, byte[]>() {
             @Override
             protected byte[] doInBackground(Void... params) {