Add missing copyright paragraph to the apache license file

As described in the [Appendix of the Apache 2.0 license](https://choosealicense.com/licenses/apache-2.0/#:~:text=APPENDIX%3A%20How%20to%20apply%20the%20Apache%20License%20to%20your%20work.)

Author: tamaro-skaljic

LICENSE-APACHE

@@ -174,3 +174,17 @@ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
    of your accepting any such warranty or additional liability.
 
 END OF TERMS AND CONDITIONS
+
+   Copyright (c) The Rust Project Contributors
+
+   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
+
+       http://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.