vscode-ide-integration: add license-header template (snippet)

Change-Id: Iea7837c87fd5803b225d9e18733a67c40fa915d5
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/158887
Tested-by: Jenkins
Reviewed-by: Christian Lohmaier <lohmaier+LibreOffice@googlemail.com>

.vscode/license.code-snippets

@@ -0,0 +1,21 @@
+{
+	// see TEMPLATE.SOURCECODE.HEADER
+	"MPL license header template": {
+		"prefix": ["license-header"], // last one to allow e.g. "lh" as trigger
+		"description": "Inserts the default MPL license header",
+		"scope": "cpp,c,java,javascript,objective-c,objective-cpp",
+		"isFileTemplate": true, // allow use from "Snippets: Populate File from Snippet command
+		"body": [
+			"/* -*- Mode: ${1|C++,C,Java,JS,ObjC|}; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */",
+			"/*",
+			" * This file is part of the LibreOffice project.",
+			" *",
+			" * This Source Code Form is subject to the terms of the Mozilla Public",
+			" * License, v. 2.0. If a copy of the MPL was not distributed with this",
+			" * file, You can obtain one at http://mozilla.org/MPL/2.0/.",
+			" */",
+			"","${0:$LINE_COMMENT your code goes here...}","",
+			"/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */"
+		]
+	}
+}