[babylon-docs:master] Integrated: Article on code models

[Paul Sandoz]

Article on code models.

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Commit messages:
 - Article on code models.

Changes: https://git.openjdk.org/babylon-docs/pull/5/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon-docs&pr=5&range=00
  Stats: 1341 lines in 2 files changed: 1341 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/babylon-docs/pull/5.diff
  Fetch: git fetch https://git.openjdk.org/babylon-docs.git pull/5/head:pull/5

PR: https://git.openjdk.org/babylon-docs/pull/5