Add missing copyright headers

Autoported commit.
Original commit hash: [83b3c3a3f]

Author: iText-CI

itext/itext.layout/itext/layout/properties/JustifyContent.cs

@@ -1,3 +1,25 @@
+/*
+This file is part of the iText (R) project.
+Copyright (c) 1998-2021 iText Group NV
+Authors: iText Software.
+
+This program is offered under a commercial and under the AGPL license.
+For commercial licensing, contact us at https://itextpdf.com/sales.  For AGPL licensing, see below.
+
+AGPL licensing:
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
 namespace iText.Layout.Properties {
     /// <summary>
     /// A enum containing potential property values for

port-hash

@@ -1 +1 @@
-58f1e502e2ffeadc6c6df4dd6438a3f757fd144d
+83b3c3a3f27949ab04ab2ffaa0927672b3199b5d