Implementation plan for GUI application

[dashohoxha]

Some coarse implementation tasks:

• Initialization steps.
• Creating a new key.
• Sign and verify.
• Encrypt and decrypt.
• Settings.
• Key management.
• Contact management.

[diveshuttam]

Most of Contact management and creating a new key is done. Contact management has #86 remaining. Will create a PR tomorrow after completing and testing #86 .