[jfx14] RFR: 8240631: Create release notes for JavaFX 14

[Johan Vos]

Add release notes for JavaFX 14 release
Fix for JDK-8240631

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Commits:
 - 9db2ff25: Add release notes for JavaFX 14 release

Changes: https://git.openjdk.java.net/jfx/pull/139/files
 Webrev: https://webrevs.openjdk.java.net/jfx/139/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8240631
  Stats: 81 lines in 1 file changed: 81 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jfx/pull/139.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/139/head:pull/139

PR: https://git.openjdk.java.net/jfx/pull/139