RFR: 8262460: Create release notes for JavaFX 16

[Abhinay Agarwal]

Add release notes for JavaFX 16 to the repository

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Commit messages:
 - 8262460: Create release notes for JavaFX 16

Changes: https://git.openjdk.java.net/jfx/pull/414/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jfx&pr=414&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8262460
  Stats: 115 lines in 1 file changed: 115 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jfx/pull/414.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/414/head:pull/414

PR: https://git.openjdk.java.net/jfx/pull/414