Update README.md

README.md

@@ -17,6 +17,7 @@
 ## Table of Contents
 
 * [About the Project](#about-the-project)
+  * [Documentation](#documentation)
   * [Built with](#built-with)
 * [Usage](#usage)
   * [Validity ranges](#validity-ranges)
@@ -43,7 +44,7 @@ collecting the grasp of the optics, the filter transmission efficiency and the d
 
 ### Documentation
 
-The 
+The detailed description of the activity, including the verification and validation, can be found in the WP 9.8 Technical Note.