Update README.md

Author: RezaGholamzad

java16/README.md

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+Features : 
+
+338:	Vector API (Incubator)
+
+347:	Enable C++14 Language Features
+
+357:	Migrate from Mercurial to Git
+
+369:	Migrate to GitHub
+
+376:	ZGC: Concurrent Thread-Stack Processing
+
+380:	Unix-Domain Socket Channels
+
+386:	Alpine Linux Port
+
+387:	Elastic Metaspace
+
+388:	Windows/AArch64 Port
+
+389:	Foreign Linker API (Incubator)
+
+390:	Warnings for Value-Based Classes
+
+392:	Packaging Tool
+
+393:	Foreign-Memory Access API (Third Incubator)
+
+394:	Pattern Matching for instanceof
+
+395:	Records
+
+396:	Strongly Encapsulate JDK Internals by Default
+
+397:	Sealed Classes (Second Preview)
+
+Resource : https://openjdk.java.net/projects/jdk/16/