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README.md

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+[![Build status](https://ci.appveyor.com/api/projects/status/plm9o9tkcf27g7hc/branch/master?svg=true)](https://ci.appveyor.com/project/k-takata/bregonig/branch/master)
+
+# bregonig.dll
+
+This is a source code package of bregonig.dll regular expression library.
+
+Binary packages and documents are available at the following site:  
+http://k-takata.o.oo7.jp/mysoft/bregonig.html (Japanese)
+
+Bregonig.dll is a regular expression library compatible with bregexp.dll.
+Bregexp.dll was widely used in Japanese Win32 applications, but the regexp
+engine was very old. (It seems to be a modified version of Perl 5.00x.)
+On the other hand, bregonig.dll uses Oniguruma (or Onigmo) to support
+more powerful regexp patterns.
+
+## LICENSE
+
+You may distribute under the terms of either the GNU General Public
+License or the Artistic License.
+
+## References
+
+* bregexp.dll:  
+  http://www.hi-ho.ne.jp/babaq/bregexp.html (Japanese)
+
+* Oniguruma:  
+  http://github.com/kkos/oniguruma  
+  Compatible with Perl 5.8's regexp patterns.
+
+* Onigmo (Oniguruma-mod):  
+  https://github.com/k-takata/Onigmo  
+  Compatible with Perl 5.14's regexp patterns.