Add README.md file

Author: beaver-dev

README.md

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+# FeatherBB BBCode Toolbar
+Set of helpers to write your BBCode messages.
+
+## Description
+
+Add a buttons toolbar above message fields to help you manipulate BBcode tags easily.
+
+## Features
+
+- Bold, italic, underlined text
+- Alignments : left, right, centered or justified
+- Color picker
+- Links & images
+- Lists, code & quotations
+
+## Changelog
+
+### v0.3.1
+Add french translation & sandbox code for minification
+
+### v0.3.0
+Add \_upgrade.php script
+
+### v0.2.0
+Add compatibility with Slim v3
+
+### v0.1.0
+Initial commit.