Update README.md

Author: engineerscodes

README.md

@@ -9,3 +9,7 @@ My Daily Java Works
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+# THREAD NOTES
+ 1) [Potential concurrency issue when Integer object is used as a lock in synchronized block](https://gist.github.com/engineerscodes/312780a6c710a9d7ba0a87b074c2c9f0)