[jfx-tests] RFR: 8197397: Document steps for setting up and executing manual/automated tests in jfx-tests repo

[Ajit Ghaisas]

- Removed README file
- Added README.md file with details

For formatted output of README.md - See : https://github.com/aghaisas/jfx-tests/tree/update_readme

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Commit messages:
 - add newline
 - Update bullet points
 - Add README.md

Changes: https://git.openjdk.org/jfx-tests/pull/11/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx-tests&pr=11&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8197397
  Stats: 83 lines in 2 files changed: 69 ins; 14 del; 0 mod
  Patch: https://git.openjdk.org/jfx-tests/pull/11.diff
  Fetch: git fetch https://git.openjdk.org/jfx-tests.git pull/11/head:pull/11

PR: https://git.openjdk.org/jfx-tests/pull/11