feat(main.js): Prototype early string obfuscation behavior

* Interweaves the two initial values of regPlate & stockID
* Appends the 9th character of stockID to obfuscated string
* logs obfuscated string once complete
* Uses Angular's $log to safely output to the console

* TODO: Safely use the reverse of the regPlate string
* TODO: Add hyphen in the appropriate position of the obfuscated string
* TODO: create obfuscated string when valid input conditions are met