docs: update license text in readme files (#1667)

Author: MarcusNotheis

packages/base/README.md

@@ -35,5 +35,5 @@ export default MyComponent;
 Please check our [Contribution Guidelines](https://github.com/SAP/ui5-webcomponents-react/blob/master/CONTRIBUTING.md).
 
 ## License
-Copyright (c) 2019 SAP SE or an SAP affiliate company. All rights reserved.
-This file is licensed under the Apache Software License, Version 2.0 except as noted otherwise in the [LICENSE](https://github.com/SAP/ui5-webcomponents-react/blob/master/LICENSE) file.
+Please see our [LICENSE](https://github.com/SAP/ui5-webcomponents-react/blob/main/LICENSE) for copyright and license information.
+Detailed information including third-party components and their licensing/copyright information is available via the [REUSE tool](https://api.reuse.software/info/github.com/SAP/ui5-webcomponents-react).

packages/charts/README.md

@@ -30,5 +30,5 @@ These commands will create a new folder in the src folder, containing the index,
 Please check our [Contribution Guidelines](https://github.com/SAP/ui5-webcomponents-react/blob/master/CONTRIBUTING.md).
 
 ## License
-Copyright (c) 2019 SAP SE or an SAP affiliate company. All rights reserved.
-This file is licensed under the Apache Software License, Version 2.0 except as noted otherwise in the [LICENSE](https://github.com/SAP/ui5-webcomponents-react/blob/master/LICENSE) file.
+Please see our [LICENSE](https://github.com/SAP/ui5-webcomponents-react/blob/main/LICENSE) for copyright and license information.
+Detailed information including third-party components and their licensing/copyright information is available via the [REUSE tool](https://api.reuse.software/info/github.com/SAP/ui5-webcomponents-react).

packages/main/README.md

@@ -15,5 +15,5 @@ You can find an interactive documentation in our [Storybook](https://sap.github.
 Please check our [Contribution Guidelines](https://github.com/SAP/ui5-webcomponents-react/blob/master/CONTRIBUTING.md).
 
 ## License
-Copyright (c) 2019 SAP SE or an SAP affiliate company. All rights reserved.
-This file is licensed under the Apache Software License, Version 2.0 except as noted otherwise in the [LICENSE](https://github.com/SAP/ui5-webcomponents-react/blob/master/LICENSE) file.
+Please see our [LICENSE](https://github.com/SAP/ui5-webcomponents-react/blob/main/LICENSE) for copyright and license information.
+Detailed information including third-party components and their licensing/copyright information is available via the [REUSE tool](https://api.reuse.software/info/github.com/SAP/ui5-webcomponents-react).