update license file to include creative commons terms (#3074)

After team discussions the decision has been made to update our license
to protect content under a creative commons license that is more
appropriate than apache 2.0 (which is designed for code). all code
remains licensed under apache 2.0

Author: javabster

LICENSE

@@ -1,3 +1,11 @@
+This repository is dual-licensed to distinguish between code and content.
+   - Code (including scripts, source files, and code snippets in documentation
+      examples) is licensed under the Apache License 2.0.
+   - Content (including guides, tutorials, courses, media, and other non-code 
+      assets) is licensed under the Creative Commons Attribution-ShareAlike 4.0 
+      International (CC BY-SA 4.0).
+   
+   
                                  Apache License
                            Version 2.0, January 2004
                         http://www.apache.org/licenses/
@@ -198,4 +206,4 @@
    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.
+   limitations under the License.