Add Japanese README explaining how to add new conversion.

English README will come soon...

diff --git a/src/backend/utils/mb/conversion_procs/README.euc_jp b/src/backend/utils/mb/conversion_procs/README.euc_jp
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+++ b/src/backend/utils/mb/conversion_procs/README.euc_jp
@@ -0,0 +1,83 @@
+¿·¤·¤¤¥¨¥ó¥³¡¼¥Ç¥£¥ó¥°ÊÑ´¹´Ø¿ô¤ÎÄɲÃÊýË¡
+
+       2002/07/24 Tatsuo Ishii
+
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+/usr/local/pgsql/share/conversion_create.sql ¤ÎÃæ¤ÇÅÐÏ¿¤µ¤ì¤Þ¤¹(¤³¤Î¥Õ¥¡
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+
+  conv_proc(
+       INTEGER,        -- source encoding id
+       INTEGER,        -- destination encoding id
+       OPAQUE,         -- source string (null terminated C string)
+       OPAQUE,         -- destination string (null terminated C string)
+       INTEGER         -- source string length
+  ) returns INTEGER;   -- dummy. returns nothing, actually.
+
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+  ¥¨¥ó¥³¡¼¥Ç¥£¥ó¥°ID¤Ïinclude/mb/pg_wchar.h¤Îtypedef enum pg_enc¤ÇÄêµÁ
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+  (1) DIRS=¤Î¸å¤Ë¥µ¥Ö¥Ç¥£¥ì¥¯¥È¥ê̾¤òÄɲä·¤Þ¤¹¡¥
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+  (2) @set \ ¤Ç»Ï¤Þ¤ë¹àÌܤ˵­½Ò¤òÄɲä·¤Þ¤¹¡¥1´Ø¿ô¤Ë¤Ä¤­1¹Ô¤ÎÄɲä¬É¬Í×
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+  ¤Þ¤¯¤¤¤¯¤³¤È¤ò³Îǧ¤·¤Þ¤¹¡¥Æäˡ¤create_conversion.sql¤¬¤Á¤ã¤ó¤È¤·¤¿
+  ÆâÍƤˤʤäƤ¤¤ë¤«¤É¤¦¤«³Îǧ¤·¤Þ¤·¤ç¤¦¡¥Îɤµ¤½¤¦¤À¤Ã¤¿¤é¡¤¥Æ¥¹¥ÈÍѤË
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+  $ psql -e -f create_conversion.sql test
+
+  ¤³¤ì¤âÀµ¾ï¤À¤Ã¤¿¤é¡¤ºÇ¸å¤Ëregression test suite¤Ë¥Æ¥¹¥È¹àÌܤòÄɲä·
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