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Add links to code locations to the README.md for modules/encoding. Also
clarify that only ISO-2022-JP has been patched in ICU.

Change-Id: Id1058d8ab4971da05c59e7f65b4f2f69987e7419
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2397973
Commit-Queue: Joshua Bell <jsbell@chromium.org>
Reviewed-by: Joshua Bell <jsbell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805145}