Create README.md

Author: nickion

README.md

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+# php-openssl-cryptor
+
+This is a simple class demonstrating use of the basic openssl encrypt/decrypt 
+routines in PHP.
+
+The Cryptor class supports arbitrary encryption and key hashing algorithms, along
+with raw, base64 and hex encoding of the encrypted data. Static convenience methods
+are provided for the default of AES, but a cryptor instance can be used for more
+flexibility. The default uses aes-256-ctr to avoid the need for padding and the related
+issues. Unfortunately GCM cannot be used as the PHP openssl module does not provide 
+a way to retrieve the GCM tag. This is proposed to be remedied in PHP 7.1 when 
+associated data can be retrieved.