RFR: 6697: Moving the agent to a top level directory

[Marcus Hirt]

See the issue for more information.

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Commits:
 - 9c01b24a: More updates for the readme
 - 10163648: 6697: Moving and updating readme

Changes: https://git.openjdk.java.net/jmc/pull/57/files
 Webrev: https://webrevs.openjdk.java.net/jmc/57/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JMC-6697
  Stats: 110 lines in 66 files changed: 36 ins; 74 del; 0 mod
  Patch: https://git.openjdk.java.net/jmc/pull/57.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/57/head:pull/57

PR: https://git.openjdk.java.net/jmc/pull/57