RFR: 6855: Should add information about where to get builds to README [v3]

[Marcus Hirt]

> Adding binary download info and cleaning up a bit

Marcus Hirt has updated the pull request incrementally with one additional commit since the last revision:

  Removing Oracle downloadable update site archive

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Changes:
  - all: https://git.openjdk.java.net/jmc/pull/91/files
  - new: https://git.openjdk.java.net/jmc/pull/91/files/29c8578d..76719974

Webrevs:
 - full: https://webrevs.openjdk.java.net/jmc/91/webrev.02
 - incr: https://webrevs.openjdk.java.net/jmc/91/webrev.01-02

  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 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