added documentation to main repository.

documentation/other/crypt.md

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+## Encryption
+
+- [The Basics](#basics)
+- [Encrypting A String](#encrypt)
+- [Decrypting A String](#decrypt)
+
+<a name="basics"></a>
+### The Basics
+
+Need to do secure, two-way encryption? Laravel has you covered with the **Crypt** class. The Crypt class provides strong AES-256 encryption and decryption out of the box via the Mcrypt PHP extension.
+
+To get started, you must set your **application key** in the **application/config/application.php** file. This key should be very random and very secret, as it will be used during the encryption and decryption process. It is best to use a random, 32 character alpha-numeric string:
+
+	'key' => 'xXSAVghP7myRo5xqJAnMvQwBc7j8qBZI';
+
+Wonderful. You're ready to start encrypting.
+
+> **Note:** Don't forget to install the Mcrypt PHP extension on your server.
+
+<a name="encrypt"></a>
+### Encrypting A String
+
+Encrypting a string is a breeze. Just pass it to the **encrypt** method on the Crypt class:
+
+	Crypt::encrypt($value);
+
+Do you feel like James Bond yet?
+
+<a name="decrypt"></a>
+### Decrypting A String
+
+So you're ready to decrypt a string? It's simple. Just use the **decrypt** method on the Crypt class:
+
+	Crypt::decrypt($encrypted_value);
+
+> **Note:** The decrypt method will only decrypt strings that were encrypted using **your** application key.