Added suggestions from Sami

CONTRIBUTING.md

@@ -29,4 +29,11 @@ We have defined only very few rules how your commits shall look like and how the
   * To resolve conflicts, rebase pull request branches onto their target branch 
   * please make sure that your contributions are [REUSE](https://reuse.software/) conformant
 
+For reuse conformance please provide the following information in every new file you intend to contribute:
+```
+# SPDX-FileCopyrightText: 2020 name of Copright owner
+# SPDX-License-Identifier: License you have chosen
+```
+In case you contribute binaries, like pictures etc., check for the reuse best practice for binaries.
+
 If you want to learn more the git project provides very good documentation about [how to submit patches](https://github.com/git/git/blob/master/Documentation/SubmittingPatches)

Charter.md

@@ -79,7 +79,7 @@ If you object you must support your objection and provide an alternative course
 ## License policy
 We follow a simple and clear approach in regard to licensing. All artifacts which are documentation are per default licensed under CC-BY-SA-4.0, we also accept contributions under CC0-1.0
 
-All artifacts which are code (including tests) are licensed under MIT.
+All artifacts which are code (including tests) are licensed under MIT or under its original license (for already existing code that shall be contributed).
 
 
 ## Attribution