Copyright for abseil source package in Experimental

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: Abseil
Upstream-Contact: abseil-io@googlegroups.com
Source: https://github.com/abseil/abseil-cpp/
Copyright: 2017 The Abseil Authors
License: Apache-2.0

Files: *
Copyright:
 2000-2017 Google Inc.
 2017-2023 The Abseil Authors
License: Apache-2.0

Files: debian/*
Copyright: 2020-2022 Google LLC
License: Apache-2.0

Files: debian/patches/riscv-nan-formatting.diff
Copyright: 2024 aurel32 
License: Apache-2.0

License: Apache-2.0
 Licensed under the Apache License, Version 2.0 (the "License"); you may not use
 this file except in compliance with the License. You may obtain a copy of the
 License at
 .
     https://www.apache.org/licenses/LICENSE-2.0
 .
 Unless required by applicable law or agreed to in writing, software distributed
 under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
 CONDITIONS OF ANY KIND, either express or implied. See the License for the
 specific language governing permissions and limitations under the License.
 .
 On Debian systems, the complete text of the Apache License, Version 2.0, can be
 found in "/usr/share/common-licenses/Apache-2.0".