Added programm "Passpad"

www/data/programs/desc/Passpad/index.markdown

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+A simple *(portable, single-executable)* editor for encrypted textfiles
+
+Supports:
+
+ - AES-256
+ - Blowfish
+ - Twofish
+ - CAST-128
+ - DES
+ - Triple DES
+
+![MainWindow](https://raw.githubusercontent.com/Mikescher/Passpad/master/README-DATA/main.png)
+
+The encrypted data is encoded as base-64 and saved in a simple text-file
+
+![MainWindow](https://raw.githubusercontent.com/Mikescher/Passpad/master/README-DATA/fileformat.png)
+
+You can optionally specify a password hint for your encrypted files:
+
+![MainWindow](https://raw.githubusercontent.com/Mikescher/Passpad/master/README-DATA/hint.png)