Update TODO with things to do

TODO.md

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+# TODOs for the project
+## UI/UX
+1. Beautify interface
+2. Implement avatar support
+## Cybersecurity
+1. Implement SSH-based encryption/decryption in transmission
+Client 1    => encrypt with pubcert_s   => Server       => decrypt with privcert_s  => encrypt with pubcert_2   => Client 2     => decrypt with privcert2
+plaintext   => ciphertext               => ciphertext   => plaintext                => ciphertext               => ciphertext   => plaintext
+Clients need to have server's pubcert,
+Server needs to contain pubcerts of each client,