First draft interfaces readme

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@58127 65644016-39b1-43b1-bf79-96bc8fe82c15
Fixed after renaming configure.in

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@58128 65644016-39b1-43b1-bf79-96bc8fe82c15
RAII improvements and better usage of initializer in UDR examples.

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@58129 65644016-39b1-43b1-bf79-96bc8fe82c15