Add readme

Author: revig

README.md

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+# LiveCode encryption library
+
+This encryption library is borrowed from revIgniter's encryption library
+and includes all features as described in the revIgniter User Guide
+(see chapter [Encryption Library](https://revigniter.com/userGuide/libraries/encryption.html)).
+It is meant to be used with desktop and mobile apps.
+
+### Requirements
+
+LiveCode version 9 or higher
+
+### How to use this library:
+
+Place the library in the message path, then 
+
+### License
+
+For the license terms see the LICENSE file.
+
+### Meta
+
+Version: 1.0.0  
+Web Site: <https://revigniter.com/>
+
+Author:  Ralf Bitter