RFR: 6855: Should add information about where to get builds to README

[Marcus Hirt]

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Adding binary download info and cleaning up a bit

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Commit messages:
 - 6855: Adding binary download info and cleaning up a bit

Changes: https://git.openjdk.java.net/jmc/pull/91/files
 Webrev: https://webrevs.openjdk.java.net/jmc/91/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JMC-6855
  Stats: 46 lines in 1 file changed: 38 ins; 1 del; 7 mod
  Patch: https://git.openjdk.java.net/jmc/pull/91.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/91/head:pull/91

PR: https://git.openjdk.java.net/jmc/pull/91