RFR: Initial section on testing [v5]

[Jesper Wilhelmsson]

> It's a start.

Jesper Wilhelmsson has updated the pull request incrementally with one additional commit since the last revision:

  C++ testing using JTReg.

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Changes:
  - all: https://git.openjdk.java.net/guide/pull/30/files
  - new: https://git.openjdk.java.net/guide/pull/30/files/ec901768..c3425990

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=guide&pr=30&range=04
 - incr: https://webrevs.openjdk.java.net/?repo=guide&pr=30&range=03-04

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/guide/pull/30.diff
  Fetch: git fetch https://git.openjdk.java.net/guide pull/30/head:pull/30

PR: https://git.openjdk.java.net/guide/pull/30