Add publish folder and scripts, composer json update, readme add

ReadMe.md

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+# Extended Exceptions
+
+A group of extended Exceptions
+
+- SQL errors
+- File handling
+
+## Setup from central composer
+
+Setup from gitea internal servers
+
+```sh
+composer config repositories.git.egplusww.jp.Composer composer https://git.egplusww.jp/api/packages/Composer/composer
+```
+
+Alternative setup composer local zip file repot:
+`composer config repositories.composer.egplusww.jp composer http://composer.egplusww.jp`
+
+## Install package
+
+`composer require egrajp/exceptions-extended`