docs: add links and legal notice

eclipse-tractusx#134
eclipse-tractusx#133

Author: evegufy

FILEHEADER.md

@@ -13,3 +13,11 @@ Every time you create a new file or edit a file that you created and doesn't yet
 Currently the following templates are available:
 * cx_header_default
 * cx_header_with_#
+
+## NOTICE
+
+This work is licensed under the [Apache-2.0](https://www.apache.org/licenses/LICENSE-2.0).
+
+- SPDX-License-Identifier: Apache-2.0
+- SPDX-FileCopyrightText: 2024 Contributors to the Eclipse Foundation
+- Source URL: https://github.com/eclipse-tractusx/ssi-credential-issuer

NOTICE.md

@@ -28,7 +28,7 @@ The project maintains the following source code repositories in the GitHub organ
 
 This project leverages the following third party content.
 
-See DEPENDENCIES file.
+See [DEPENDENCIES](./DEPENDENCIES) file.
 
 ## Cryptography
 

README.md

@@ -30,6 +30,10 @@ See Docker notice files for more information:
 - [credential-expiry-app](./docker/notice-credential-expiry-app.md)
 - [credential-issuer-migrations](./docker/notice-credential-issuer-migrations.md)
 
+## Contributing
+
+See [Contribution details](/docs/technical-documentation/dev-process/How%20to%20contribute.md).
+
 ## License
 
 Distributed under the Apache 2.0 License.