[jfx18] RFR: 8290426: Create release notes for 18.0.2

[Abhinay Agarwal]

Add release notes for JavaFX 18.0.2 to the repository

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Commit messages:
 - 8290426: Create release notes for 18.0.2

Changes: https://git.openjdk.org/jfx/pull/838/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=838&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8290426
  Stats: 20 lines in 1 file changed: 20 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jfx/pull/838.diff
  Fetch: git fetch https://git.openjdk.org/jfx pull/838/head:pull/838

PR: https://git.openjdk.org/jfx/pull/838