RFR: 8293883: Add test/.classpath (Eclipse)

[Andy Goryachev]

Adding a tests/.classpath file to include tests/manual/controls source folder so Eclipse could see/execute manual tests there.

Also, I would rather move the sources there to a specific package (test.manual ?) instead of a default package. Any objections?

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Commit messages:
 - 8293883: added tests/.classpath

Changes: https://git.openjdk.org/jfx/pull/901/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=901&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8293883
  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jfx/pull/901.diff
  Fetch: git fetch https://git.openjdk.org/jfx pull/901/head:pull/901

PR: https://git.openjdk.org/jfx/pull/901