add contextual menu items to NewConversationActivity

Closes #5390
// FREEBIE

res/menu/new_conversation_activity.xml

@@ -1,7 +1,15 @@
 <?xml version="1.0" encoding="utf-8"?>
 <menu xmlns:android="http://schemas.android.com/apk/res/android"
       xmlns:app="http://schemas.android.com/apk/res-auto">
+
     <item android:title="@string/new_conversation_activity__refresh"
           android:id="@+id/menu_refresh"
           app:showAsAction="never" />
+
+    <item android:title="@string/text_secure_normal__menu_new_group"
+        android:id="@+id/menu_new_group" />
+
+    <item android:title="@string/text_secure_normal__invite_friends"
+        android:id="@+id/menu_invite" />
+
 </menu>

src/org/thoughtcrime/securesms/NewConversationActivity.java

@@ -70,8 +70,10 @@ public class NewConversationActivity extends ContactSelectionActivity {
     super.onOptionsItemSelected(item);
 
     switch (item.getItemId()) {
-    case android.R.id.home: super.onBackPressed(); return true;
-    case R.id.menu_refresh: handleManualRefresh(); return true;
+    case android.R.id.home:   super.onBackPressed(); return true;
+    case R.id.menu_refresh:   handleManualRefresh(); return true;
+    case R.id.menu_new_group: handleCreateGroup();   return true;
+    case R.id.menu_invite:    handleInvite();        return true;
     }
 
     return false;
@@ -82,6 +84,14 @@ public class NewConversationActivity extends ContactSelectionActivity {
     onRefresh();
   }
 
+  private void handleCreateGroup() {
+    startActivity(new Intent(this, GroupCreateActivity.class));
+  }
+
+  private void handleInvite() {
+    startActivity(new Intent(this, InviteActivity.class));
+  }
+
   @Override
   protected boolean onPrepareOptionsPanel(View view, Menu menu) {
     MenuInflater inflater = this.getMenuInflater();