Revert "change top-level license"

This reverts commit 78cb9b4.

CMakeLists.txt

@@ -513,7 +513,7 @@ add_custom_target(test_pkgconfig
 
 # Setup CPack
 set(CPACK_PACKAGE_DESCRIPTION_FILE "${Ginkgo_SOURCE_DIR}/README.md")
-set(CPACK_RESOURCE_FILE_LICENSE "${Ginkgo_SOURCE_DIR}/LICENSE.md")
+set(CPACK_RESOURCE_FILE_LICENSE "${Ginkgo_SOURCE_DIR}/LICENSE")
 set(CPACK_PACKAGE_ICON "${Ginkgo_SOURCE_DIR}/assets/logo.png")
 set(CPACK_PACKAGE_CONTACT "ginkgo.library@gmail.com")
 include(CPack)

LICENSE

@@ -0,0 +1,29 @@
+Copyright (c) 2017-2023, the Ginkgo authors
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+
+1. Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.