chore add licenses

LICENSE

                     GNU AFFERO GENERAL PUBLIC LICENSE
                        Version 3, 19 November 2007
+                            AGPL-3.0-or-later
 
  Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
  Everyone is permitted to copy and distribute verbatim copies

Makefile

@@ -139,7 +139,7 @@ endif
 .PHONY: fetch-licenses
 ## Fetch licenses for all modules
 fetch-licenses:
-	go-licenses save $(GO_CURRENT_MODULE) --ignore gitlab.schukai.com --force --save_path $(PROJECT_ROOT)licenses/ ; cd -
+	go-licenses save $(GO_CURRENT_MODULE) --force --save_path $(PROJECT_ROOT)licenses/ ; cd -
 
 # https://spdx.github.io/spdx-spec/v2.3/SPDX-license-list/
 ADDLICENSE_BIN ?= addlicense

doc.go

+// This package provides a simple way to negotiate the content type of HTTP requests.
+// The language, encoding and charset are also supported.
+
+// Copyright 2022 schukai GmbH
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+// 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/>.
+
+package negotiation