* remove the license section from readme
This does not mean that I'm waving the copyrights rather just formatting the README
* remove useless external links form the README lead
and also added a line about the recentness of the newest method between the availability and CDX server API.
* incr version to 3.0.6 and change date to todays da
-te that is 15th of March, 2022.
* update secsi and DI section
* v3.0.5 --> v3.0.6
