Added the API URL design to include versioning and limiting the use of PUT requests to only updating of existing records instead of allowing the creation of new records using PUT request.
* Edited table relationship info
I assume the previous author meant to add one-to-one relationships. I fixed a few typos and changed a bit of information relating to one-to-one relationships.
* Update index.md
* Update index.md
Max Ong Zong Bao
webwesen
Piyush Bajaj
13636592
Arsalaan Javed
StephonB
Mrugesh Mohapatra