Encode-JIS2K documentation

• Encode-JIS2K - README
• Encode-JIS2K - Changes
• Encode-JIS2K - META.yml
• Encode-JIS2K Makefile.PL
• Encode::JIS2K - JIS X 0212 (aka JIS 2000) Encodings  [view source]
• Encode::JIS2K::2022JP3 - internally used by Encode::JIS2K  [view source]