Added API Security Checklist

README.md

@@ -47,6 +47,7 @@ Repository | Description
 
 Repository | Description
 ---- | ----
+[API Security Checklist](https://github.com/shieldfy/API-Security-Checklist) | Checklist of the most important security countermeasures when designing, testing, and releasing your API
 [APT Notes](https://github.com/kbandla/APTnotes) 									| Various public documents, whitepapers and articles about APT campaigns
 [Bug Bounty Reference](https://github.com/ngalongc/bug-bounty-reference) 			| List of bug bounty write-up that is categorized by the bug nature
 [Cryptography](https://github.com/sobolevn/awesome-cryptography) | Cryptography resources and tools