Update documentation.md

Author: janniklth

documentation.md

@@ -16,6 +16,7 @@ final submission (Javadoc, test results, code coverage, and code metrics).
 
 The JavaDoc for the project is available in the following directory: [JavaDoc](doc/JavaDoc/index.html). For the best
 experience, please download the directory and open the index.html file in a browser.
+It is also available online: [Online JavaDoc](https://janniklth.github.io/PackageCalculator/)
 
 ## Test Results
 
@@ -63,4 +64,4 @@ The following image gives an overview of the code metrics for the project:
 For more detailed information, please use the generate CodeMR report, available from the following directory: 
 [CodeMR Report](doc/codemr/PackageCalculator/html/main_report/index.html)
 
-Note: The CodeMR report is only available in HTML format and can be opened in a browser when downloaded.
+Note: The CodeMR report is only available in HTML format and can be opened in a browser when downloaded.